Merge pull request #8140 from nicolasnoble/backport-of-8055

BUILD

CMakeLists.txt

Makefile

build.yaml

templates/tools/run_tests/sources_and_headers.json.template

tools/doxygen/Doxyfile.c++

tools/doxygen/Doxyfile.c++.internal

tools/run_tests/sanity/check_sources_and_headers.py

tools/run_tests/sources_and_headers.json

vsprojects/grpc.sln

vsprojects/vcxproj/grpc++/grpc++.vcxproj

vsprojects/vcxproj/grpc++/grpc++.vcxproj.filters

vsprojects/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj

...s/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj.filters