Fixes build with PLATFORM=gcc on OSX with clang's gcc wrapper

[avtolstoy]

Problem

PLATFORM=gcc builds fail on OSX with default gcc compiler (which is actually a wrapper over clang).

Solution

• Provide some clang-specific fixes

Steps to Test

• make PLATFORM=gcc clean all should succeed with OSX gcc:

$ gcc --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/include/c++/4.2.1
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin14.5.0
Thread model: posix

Example App

N/A

References

N/A

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Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA (Info here)
• Problem and Solution clearly stated
• Run unit/integration/application tests on device
• Added documentation (N/A)
• Added to CHANGELOG.md after merging (add links to docs and issues)

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Internal

• [PR #1359] Fixes build with PLATFORM=gcc on OSX with clang's gcc wrapper