Disable clang diagnostics pragma on windows
Disable clang diagnostics pragma on windows

Use clang diagnostics pragma only if it project is compiled with clang.

Bug: http://b/150575491
Test: ninja

google/orbit,pierricgimmig/orbitprofiler,pierricgimmig/orbitprofiler,google/orbit,google/orbit,google/orbit,pierricgimmig/orbitprofiler,pierricgimmig/orbitprofiler