add GCC/Clang compiler versions for warning flags #95
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Added a note like (only in GCC >= 4.8) or (GCC >= 4.6, Clang >= 3.8) for every suggested -Wxxx flag since they are not uniformly supported. Based on WARN_FLAGS setup code in https://github.com/ashutosh108/sb-sloka-counter/blob/d209af97b567e4e92ed8ca7500e34c759a860885/CMakeLists.txt. Verified by using godbolt.org and digging around release notes.