port: Make the project more portable #7
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This removes enough of the gcc extensions to allow another compiler to build the project: * allow overwriting CC * do not use the "--std=gnu99" commandline option * do not depend on __attribute__((weak, alias())) support * do not depend on __attribute__((vector_size())) support
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This removes enough of the gcc extensions to allow using other compilers:
Works with "tcc" / x86_64-tcc" and "i386-tcc" on Linux.
(Using owcc needs more work)