Various fixes for 32-bit Linux GN builds that need to be tracked down.

mojo/BUILD.gn

Index: mojo/BUILD.gn
diff --git a/mojo/BUILD.gn b/mojo/BUILD.gn
index 2bb0214fecd4eb1585489d46ecb23772f78077ee..3c1431b0cd9ad6048e6dbbcb5c929714a120c696 100644
--- a/mojo/BUILD.gn
+++ b/mojo/BUILD.gn
@@ -11,9 +11,15 @@ group("mojo") {
     ":tests",
     "//mojo/common",
     "//mojo/services",
-    "//third_party/mojo/src/mojo/public",
   ]
 
+  if (!(is_linux && target_cpu == "x86")) {
+    # TODO(GYP): Figure out if this needs to be supported. Right now
+    # it won't work on x86 official builds because it needs stuff in the
+    # sysroot that doesn't exist.
+    deps += [ "//third_party/mojo/src/mojo/public" ]
+  }
+
   if (is_android) {
     deps += [ "//mojo/android" ]
   }