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Brad King authored
The cleanup in commit 4f2fcce4 (Check*: Allow result variables to contain regex special characters, 2014-07-31) broke old VXL code that abuses the old "if(MATCHES)" implementation by using SET( ${VARIABLE} ${VARIABLE} ) to reset a check result variable. Add a compatibility hack to the CheckFunctionExists, CheckIncludeFileCXX, and CheckSymbolExists modules to re-run their checks when the result variable is set to its own name. Use STREQUAL instead of MATCHES so that special characters still work.
4ffec8f6