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

tools/gyp/v8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 678 matching lines @@
             '../../src/arm64/macro-assembler-arm64-inl.h',
             '../../src/arm64/regexp-macro-assembler-arm64.cc',
             '../../src/arm64/regexp-macro-assembler-arm64.h',
             '../../src/arm64/simulator-arm64.cc',
             '../../src/arm64/simulator-arm64.h',
             '../../src/arm64/stub-cache-arm64.cc',
             '../../src/arm64/utils-arm64.cc',
             '../../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',
             '../../src/ia32/assembler-ia32.h',
             '../../src/ia32/builtins-ia32.cc',
             '../../src/ia32/code-stubs-ia32.cc',
             '../../src/ia32/code-stubs-ia32.h',
             '../../src/ia32/codegen-ia32.cc',
             '../../src/ia32/codegen-ia32.h',
             '../../src/ia32/cpu-ia32.cc',
@@ skipping 44 matching lines @@
             '../../src/mips/lithium-mips.cc',
             '../../src/mips/lithium-mips.h',
             '../../src/mips/macro-assembler-mips.cc',
             '../../src/mips/macro-assembler-mips.h',
             '../../src/mips/regexp-macro-assembler-mips.cc',
             '../../src/mips/regexp-macro-assembler-mips.h',
             '../../src/mips/simulator-mips.cc',
             '../../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',
             '../../src/x64/assembler-x64.h',
             '../../src/x64/builtins-x64.cc',
             '../../src/x64/code-stubs-x64.cc',
             '../../src/x64/code-stubs-x64.h',
             '../../src/x64/codegen-x64.cc',
             '../../src/x64/codegen-x64.h',
             '../../src/x64/cpu-x64.cc',
@@ skipping 428 matching lines @@
         }],
         ['v8_compress_startup_data=="bz2"', {
           'libraries': [
             '-lbz2',
           ]
         }],
       ],
     },
   ],
 }