test suite fixes to prep for enabling additional warnings #282
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fixes to allow clean compilation of test suite with additional
clang warnings enabled.
Updated version of #274 that leaves out the problematic change to dispatch_c99.c that broke the build. There is a divergence between autotools and cmake compilation flags for dispatch_c99.c (autotools compiles this test without ${BSD_OVERLAY_CFLAGS} while CMake compiles all tests with ${BSD_OVERLAY_CFLAGS}). We can fix that later.