Add some issues that came up when comparing autotools and CMake compile flags.

Also be consistent about whether OS X is working or not, and note that
we're also doing CMake builds on Solaris.

Change-Id: I2da18d2fb5aec7e5806dc7ea186f729acef94272
Reviewed-on: https://code.wireshark.org/review/3389
Reviewed-by: Guy Harris <guy@alum.mit.edu>