Don't use m32 cflag for x86_64.

platform_tools/android/gyp/skia_android.gypi

+#
 {
   'targets': [
     {
       'target_name': 'CopySampleAppDeps',
       'type': 'none',
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'SampleApp.gyp:SampleApp',
       ],
       'variables': {
         'conditions': [
           [ 'skia_arch_type == "arm" and arm_version != 7', {
             'android_arch%': "armeabi",
           }],
           [ 'skia_arch_type == "arm" and arm_version == 7', {
             'android_arch%': "armeabi-v7a",
           }],
           [ 'skia_arch_type == "arm64"', {
             'android_arch%': "arm64-v8a",
           }],
-          [ 'skia_arch_type == "x86" and skia_arch_width == 32', {
+          [ 'skia_arch_type == "x86"', {
             'android_arch%': "x86",
           }],
-          [ 'skia_arch_type == "x86" and skia_arch_width == 64', {
+          [ 'skia_arch_type == "x86_64"', {
             'android_arch%': "x86_64",
           }],
           [ 'skia_arch_type == "mips" and skia_arch_width == 32', {
             'android_arch%': "mips",
           }],
           [ 'skia_arch_type == "mips" and skia_arch_width == 64', {
             'android_arch%': "mips64",
           }],
         ],
       },
@@ skipping 58 matching lines @@
             '-Dnative.libs.absolute.dir=<(ANDROID_OUT)/libs',
             '-Dout.final.file=<(ANDROID_OUT)/bin/SkiaAndroid.apk',
             '-Dsdk.dir=<(ANDROID_SDK_ROOT)',
             'debug',
           ],
         },
       ],
     },
   ],
 }