Don't use m32 cflag for x86_64.

gyp/skia_lib.gyp

 # The minimal set of static libraries for basic Skia functionality.
 
 {
   'variables': {
     'component_libs': [
       'core.gyp:core',
       'effects.gyp:effects',
       'images.gyp:images',
       'opts.gyp:opts',
       'ports.gyp:ports',
       'sfnt.gyp:sfnt',
       'utils.gyp:utils',
     ],
     'conditions': [
-      [ 'skia_arch_type == "x86" and skia_os != "android"', {
+      [ '"x86" in skia_arch_type and skia_os != "android"', {
         'component_libs': [
           'opts.gyp:opts_ssse3',
           'opts.gyp:opts_sse41',
         ],
       }],
       [ 'arm_neon == 1', {
         'component_libs': [
           'opts.gyp:opts_neon',
         ],
       }],
@@ skipping 27 matching lines @@
       ],
       'dependencies': [
         '<@(component_libs)',
       ],
       'export_dependent_settings': [
         '<@(component_libs)',
       ],
     },
   ],
 }