Jason Evans 99b0fbbe69 Add workaround for missing 'restrict' keyword.
Add a cpp #define that removes 'restrict' keyword usage unless the
compiler definitely supports C99.  As written, 'restrict' is only
enabled if the compiler supports the -std=gnu99 option (e.g. gcc and
llvm).

Reported by Tobias Hieta.
2014-02-24 16:08:38 -08:00
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