Bug 1484403 - Need to point pkg-config to the installed libpulse et. al libs. r=frg

suite/config/mozconfigs/mozconfig.gtk

@@ -1,13 +1,11 @@
-TOOLTOOL_DIR=${TOOLTOOL_DIR:-$topsrcdir}
-
-# $TOOLTOOL_DIR/gtk3 comes from tooltool, and must be included in the tooltool manifest.
+TOOLTOOL_DIR=${TOOLTOOL_DIR:-$topsrcdir} # $TOOLTOOL_DIR/gtk3 comes from tooltool, and must be included in the tooltool manifest.
 if [ -z "$PKG_CONFIG_LIBDIR" ]; then
   echo PKG_CONFIG_LIBDIR must be set >&2
   exit 1
 fi
 export PKG_CONFIG_SYSROOT_DIR="$TOOLTOOL_DIR/gtk3"
 export PKG_CONFIG_PATH="$TOOLTOOL_DIR/gtk3/usr/local/lib/pkgconfig"
-PKG_CONFIG="$TOOLTOOL_DIR/gtk3/usr/local/bin/pkg-config"
+PKG_CONFIG="${PKG_CONFIG_PATH}:$TOOLTOOL_DIR/gtk3/usr/local/bin/pkg-config"
 export PATH="$TOOLTOOL_DIR/gtk3/usr/local/bin:${PATH}"
 # Ensure cairo, gdk-pixbuf, etc. are not taken from the system installed packages.
 LDFLAGS="-L$TOOLTOOL_DIR/gtk3/usr/local/lib ${LDFLAGS}"

suite/config/mozconfigs/mozconfig.linux.common

@@ -1,5 +1,6 @@
 # Common statements that are applicable to both Linux32 and Linux64.
 
+export PKG_CONFIG_PAHT="${PKG_CONFIG_PATH}:/usr/lib64/pkgconfig:/usr/lib/pkgconfig"
 # Due to bug 1426785, we need to re-include mozconfig.gtk with our
 # linux* builders.
 . $TOOLTOOL_DIR/comm/suite/config/mozconfigs/mozconfig.gtk