Remove strange v8_target_arch=="mac" conditions from gyp files

tools/gyp/v8.gyp

Index: tools/gyp/v8.gyp
diff --git a/tools/gyp/v8.gyp b/tools/gyp/v8.gyp
index 9f3003b71472b98a82f3657d30d65f2f60307c72..5c51e44dfaec5341c59fc053fbeabae0950ff82a 100644
--- a/tools/gyp/v8.gyp
+++ b/tools/gyp/v8.gyp
@@ -696,7 +696,7 @@
             '../../src/arm64/utils-arm64.h',
           ],
         }],
-        ['v8_target_arch=="ia32" or v8_target_arch=="mac" or OS=="mac"', {
+        ['v8_target_arch=="ia32"', {
           'sources': [  ### gcmole(arch:ia32) ###
             '../../src/ia32/assembler-ia32-inl.h',
             '../../src/ia32/assembler-ia32.cc',
@@ -761,7 +761,7 @@
             '../../src/mips/stub-cache-mips.cc',
           ],
         }],
-        ['v8_target_arch=="x64" or v8_target_arch=="mac" or OS=="mac"', {
+        ['v8_target_arch=="x64"', {
           'sources': [  ### gcmole(arch:x64) ###
             '../../src/x64/assembler-x64-inl.h',
             '../../src/x64/assembler-x64.cc',