Fix coverage analysis for .c files #306
Merged
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Looks like the coverage analysis has been completely missing .c files.
Set CMAKE_C_FLAGS/CMAKE_C_OUTPUT_EXTENSION_REPLACE just like CXX
Fix run_gcov.sh to deduce the source file by examining the .o.d file rather than simply replacing .gcno with .cpp, which misses .c files
Add ImathHalfPerfTest to the test suite