Tom Finegan 227c7be1af Additional CMake flag handling improvements.
- Stop forcing AS/C/CXX/LINKER flags into the cache.
- Don't cache internal build system variables.
- Fix usages of PARENT_SCOPE rendered incorrect by previous
  patch.
- Fix usage of local variables within if() statements in macros;
  functions appear to allow for omission of ${} around vars in
  simple boolean checks. Macros apparently require ${} for all
  usages of if().
2017-12-23 09:27:47 -08:00
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