Details:
- Added explicit typecasting to various functions (mostly static
functions), primarily those in bli_param_macro_defs.h,
bli_obj_macro_defs.h, bli_cntx.h, bli_cntl.h, and a few other header
files.
- This change was prompted by feedback from Jacob Gorm Hansen, who
reported that #including "blis.h" from his application caused a
gcc to output error messages (relating to types being returned
mismatching the declared return types) when used via the C++ compiler
front-end. This is the first pass of fixes, and we may need to
iterate with additional follow-up commits (#233).
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