Bug 1119997 - Stop using mozilla-centos-i386 mock. r=catlee

CLOBBER

@@ -22,4 +22,4 @@
 # changes to stick? As of bug 928195, this shouldn't be necessary! Please
 # don't change CLOBBER for WebIDL changes any more.
 
-Bug 1056337 - Change default compiler for B2G ICS builds.
+Bug 1119997 - Change build environment for B2G devide builds.

b2g/config/hamachi/config.json

@@ -1,8 +1,8 @@
 {
     "config_version": 2,
     "tooltool_manifest": "releng-hamachi.tt",
-    "mock_target": "mozilla-centos6-i386",
-    "mock_packages": ["ccache", "make", "bison", "flex", "gcc", "g++", "mpfr", "zlib-devel", "ncurses-devel", "zip", "autoconf213", "glibc-static", "perl-Digest-SHA", "wget", "alsa-lib", "atk", "cairo", "dbus-glib", "fontconfig", "freetype", "glib2", "gtk2", "libXRender", "libXt", "pango", "mozilla-python27-mercurial", "openssh-clients", "nss-devel", "java-1.6.0-openjdk-devel", "git"],
+    "mock_target": "mozilla-centos6-x86_64",
+    "mock_packages": ["ccache", "make", "bison", "flex", "gcc", "g++", "mpfr", "zlib-devel", "ncurses-devel", "zip", "autoconf213", "glibc-static", "perl-Digest-SHA", "wget", "alsa-lib", "atk", "cairo", "dbus-glib", "fontconfig", "freetype", "glib2", "gtk2", "libXRender", "libXt", "pango", "mozilla-python27-mercurial", "openssh-clients", "nss-devel", "java-1.6.0-openjdk-devel", "git", "libstdc++.i686", "zlib-devel.i686", "ncurses-devel.i686", "libX11-devel.i686", "mesa-libGL-devel.i686", "mesa-libGL-devel", "libX11-devel"],
     "mock_files": [["/home/cltbld/.ssh", "/home/mock_mozilla/.ssh"]],
     "build_targets": [],
     "upload_files": [

b2g/config/hamachi/limited-memory-config.json

@@ -2,8 +2,8 @@
     "config_version": 2,
     "tooltool_manifest": "releng-limited-memory.tt",
     "tooltool_bootstrap_cmd": ["bash", "-xe", "tt_setup.sh"],
-    "mock_target": "mozilla-centos6-i386",
-    "mock_packages": ["ccache", "make", "bison", "flex", "gcc", "g++", "mpfr", "zlib-devel", "ncurses-devel", "zip", "autoconf213", "glibc-static", "perl-Digest-SHA", "wget", "alsa-lib", "atk", "cairo", "dbus-glib", "fontconfig", "freetype", "glib2", "gtk2", "libXRender", "libXt", "pango", "mozilla-python27-mercurial", "openssh-clients", "nss-devel", "java-1.6.0-openjdk-devel", "git"],
+    "mock_target": "mozilla-centos6-x86_64",
+    "mock_packages": ["ccache", "make", "bison", "flex", "gcc", "g++", "mpfr", "zlib-devel", "ncurses-devel", "zip", "autoconf213", "glibc-static", "perl-Digest-SHA", "wget", "alsa-lib", "atk", "cairo", "dbus-glib", "fontconfig", "freetype", "glib2", "gtk2", "libXRender", "libXt", "pango", "mozilla-python27-mercurial", "openssh-clients", "nss-devel", "java-1.6.0-openjdk-devel", "git", "libstdc++.i686", "zlib-devel.i686", "ncurses-devel.i686", "libX11-devel.i686", "mesa-libGL-devel.i686", "mesa-libGL-devel", "libX11-devel"],
     "mock_files": [["/home/cltbld/.ssh", "/home/mock_mozilla/.ssh"]],
     "build_targets": [],
     "upload_files": [

b2g/config/helix/config.json

@@ -1,8 +1,8 @@
 {
     "config_version": 2,
     "tooltool_manifest": "releng-helix.tt",
-    "mock_target": "mozilla-centos6-i386",
-    "mock_packages": ["ccache", "make", "bison", "flex", "gcc", "g++", "mpfr", "zlib-devel", "ncurses-devel", "zip", "autoconf213", "glibc-static", "perl-Digest-SHA", "wget", "alsa-lib", "atk", "cairo", "dbus-glib", "fontconfig", "freetype", "glib2", "gtk2", "libXRender", "libXt", "pango", "mozilla-python27-mercurial", "openssh-clients", "nss-devel", "java-1.6.0-openjdk-devel", "git"],
+    "mock_target": "mozilla-centos6-x86_64",
+    "mock_packages": ["ccache", "make", "bison", "flex", "gcc", "g++", "mpfr", "zlib-devel", "ncurses-devel", "zip", "autoconf213", "glibc-static", "perl-Digest-SHA", "wget", "alsa-lib", "atk", "cairo", "dbus-glib", "fontconfig", "freetype", "glib2", "gtk2", "libXRender", "libXt", "pango", "mozilla-python27-mercurial", "openssh-clients", "nss-devel", "java-1.6.0-openjdk-devel", "git", "libstdc++.i686", "zlib-devel.i686", "ncurses-devel.i686", "libX11-devel.i686", "mesa-libGL-devel.i686", "mesa-libGL-devel", "libX11-devel"],
     "mock_files": [["/home/cltbld/.ssh", "/home/mock_mozilla/.ssh"]],
     "build_targets": [],
     "upload_files": [

b2g/config/wasabi/config.json

@@ -1,8 +1,8 @@
 {
     "config_version": 2,
     "tooltool_manifest": "releng-wasabi.tt",
-    "mock_target": "mozilla-centos6-i386",
-    "mock_packages": ["ccache", "make", "bison", "flex", "gcc", "g++", "mpfr", "zlib-devel", "ncurses-devel", "zip", "autoconf213", "glibc-static", "perl-Digest-SHA", "wget", "alsa-lib", "atk", "cairo", "dbus-glib", "fontconfig", "freetype", "glib2", "gtk2", "libXRender", "libXt", "pango", "mozilla-python27-mercurial", "openssh-clients", "nss-devel", "java-1.6.0-openjdk-devel", "git"],
+    "mock_target": "mozilla-centos6-x86_64",
+    "mock_packages": ["ccache", "make", "bison", "flex", "gcc", "g++", "mpfr", "zlib-devel", "ncurses-devel", "zip", "autoconf213", "glibc-static", "perl-Digest-SHA", "wget", "alsa-lib", "atk", "cairo", "dbus-glib", "fontconfig", "freetype", "glib2", "gtk2", "libXRender", "libXt", "pango", "mozilla-python27-mercurial", "openssh-clients", "nss-devel", "java-1.6.0-openjdk-devel", "git", "libstdc++.i686", "zlib-devel.i686", "ncurses-devel.i686", "libX11-devel.i686", "mesa-libGL-devel.i686", "mesa-libGL-devel", "libX11-devel"],
     "mock_files": [["/home/cltbld/.ssh", "/home/mock_mozilla/.ssh"]],
     "build_targets": [],
     "upload_files": [