Added memory protection to prevent mismatching of mem_d or vec_free on pointers which are otherwise unknown to be allocated memory or allocated vectors. Also fixed the preprocessor to only strip on ' ' and '\t' around macros.
Only increment the buffer location for macro output whitespace stripping if the situation is actually stripable, otherwise macros like #define foo(X) bar(#X), with foo(test) will expand to bartest) instead of bar(test). This should fix Xonotic builds.
On platforms that the byte order check fails on the runtime test is concluded instead. It still needs these swap functions at compile time since the runtime test has to run. This fixes a FTBFS on BE selected ARMs.