Revert some .gyp refactoring to fix ARM cross-compilation

build/v8-features.gypi

Index: build/v8-features.gypi
diff --git a/build/v8-features.gypi b/build/v8-features.gypi
index 099c8f429dff7e9a38d0e14b948d37ba20a0f455..45235db08d0c3b67e863ab7a4558e3ec28fac89a 100644
--- a/build/v8-features.gypi
+++ b/build/v8-features.gypi
@@ -97,12 +97,6 @@
                   'USE_EABI_HARDFLOAT=0',
                 ],
               }],
-              # The ARM assembler assumes the host is 32 bits,
-              # so force building 32-bit host tools.
-              [ 'host_arch=="x64" and _toolset=="host "', {
-                'cflags': ['-m32'],
-                'ldflags': ['-m32'],
-              }],
             ],
           }],
           ['v8_target_arch=="ia32"', {