GYP changes for arm64 linux build

third_party/libwebp/libwebp.gyp

Index: third_party/libwebp/libwebp.gyp
diff --git a/third_party/libwebp/libwebp.gyp b/third_party/libwebp/libwebp.gyp
index 7174c1fbf6490d78958a9a04c39273be3dfc615f..947bd78b881b669a6f06abc9401a68682752f10c 100644
--- a/third_party/libwebp/libwebp.gyp
+++ b/third_party/libwebp/libwebp.gyp
@@ -181,8 +181,9 @@
               'cflags!': [ '-mfpu=vfpv3-d16' ],
               'cflags': [ '-mfpu=neon' ],
             }],
-            ['target_arch == "arm64"', {
+            ['target_arch == "arm64" and OS == "android"', {

[jzern, 2016/05/31 23:37:15]

you should be able to check is_clang, not sure if there's an is_gcc

[apatole, 2016/06/01 05:25:41]

OK, thanks for review, will check how it can be reused. I added "OS == android"
check as I thought android is the only arm64 target other than linux.

               # avoid an ICE with gcc-4.9: b/15574841
+              # Disable it for linux arm64 as clang build fails with error - unsupported flag.
               'cflags': [ '-frename-registers' ],
             }],
           ]