Suppress psabi warnings in GN build.

build/config/compiler/BUILD.gn

Index: build/config/compiler/BUILD.gn
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 2d9564f3e1d1d47aa74c2a8fd8fa57da05c356e2..e213e17431713faf604710c91fbec19f4b370016 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -603,6 +603,11 @@ config("default_warnings") {
       ]
     }
 
+    # Suppress warnings about ABI changes on ARM (Clang doesn't support this).

[Nico, 2014/05/21 19:43:59]

"support" is a strange word for working around silly warnings it doesn't print
in the first place :-P

[brettw, 2014/05/21 20:07:32]

I clarified this.

+    if (cpu_arch == "arm" && !is_clang) {
+      cflags += [ "-Wno-psabi" ]
+    }
+
     if (is_android) {
       # Disable any additional warnings enabled by the Android build system but
       # which chromium does not build cleanly with (when treating warning as