Fix warning which complain macro not defined

[xiaoxiang781216]

internal/gtest-port.h:437:29: warning: "__EXCEPTIONS" is not defined, evaluates to 0 [-Wundef] internal/gtest-port.h:2132:5: warning: "_MSC_VER" is not defined, evaluates to 0 [-Wundef]

Signed-off-by: litong12 [email protected]

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[derekmauro]

This doesn't build:

googletest/src/gtest.cc:113:5: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
#if GTEST_HAS_EXCEPTIONS
    ^
googletest/include/gtest/internal/gtest-port.h:430:4: note: expanded from macro 'GTEST_HAS_EXCEPTIONS'
  (defined(__EXCEPTIONS) && __has_feature(cxx_exceptions))

[xiaoxiang781216]

This doesn't build:

googletest/src/gtest.cc:113:5: error: macro expansion producing 'defined' has undefined behavior [-Werror,-Wexpansion-to-defined]
#if GTEST_HAS_EXCEPTIONS
    ^
googletest/include/gtest/internal/gtest-port.h:430:4: note: expanded from macro 'GTEST_HAS_EXCEPTIONS'
  (defined(__EXCEPTIONS) && __has_feature(cxx_exceptions))

Fixed.