Bug 1383892 - Disable stylo OSX builds for SeaMonkey. rs=bustage-fix

See Bug 1380171 [Disable stylo builds for thunderbird].

suite/config/mozconfigs/macosx64/debug

@@ -16,3 +16,9 @@ MOZ_REQUIRE_SIGNING=0
 export MOZ_PACKAGE_JSSHELL=1
 
 ac_add_options --with-ccache
+
+# Disable stylo.
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1380171
+ac_add_options --disable-stylo
+
+unset LLVM_CONFIG

suite/config/mozconfigs/macosx64/l10n-mozconfig

@@ -18,3 +18,9 @@ export MOZILLA_OFFICIAL=1
 MOZ_ADDON_SIGNING=0
 # Disable enforcing that add-ons are signed by the trusted root
 MOZ_REQUIRE_SIGNING=0
+
+# Disable stylo.
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1380171
+ac_add_options --disable-stylo
+
+unset LLVM_CONFIG

suite/config/mozconfigs/macosx64/nightly

@@ -18,3 +18,9 @@ MOZ_ADDON_SIGNING=0
 MOZ_REQUIRE_SIGNING=0
 
 ac_add_options --with-ccache
+
+# Disable stylo.
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1380171
+ac_add_options --disable-stylo
+
+unset LLVM_CONFIG

suite/config/mozconfigs/macosx64/release

@@ -15,3 +15,9 @@ MOZ_REQUIRE_SIGNING=0
 
 # Package js shell
 export MOZ_PACKAGE_JSSHELL=1
+
+# Disable stylo.
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1380171
+ac_add_options --disable-stylo
+
+unset LLVM_CONFIG

suite/config/mozconfigs/macosx64/release-l10n

@@ -18,3 +18,9 @@ export MOZILLA_OFFICIAL=1
 MOZ_ADDON_SIGNING=0
 # Disable enforcing that add-ons are signed by the trusted root
 MOZ_REQUIRE_SIGNING=0
+
+# Disable stylo.
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1380171
+ac_add_options --disable-stylo
+
+unset LLVM_CONFIG