Fix duplicated symbol when compiling on GCC
Fix duplicated symbol when compiling on GCC

Signed-off-by: Vicent Marti <6838a7c51796da15c3e6eae80ee6aba806e8818a@gmail.com>

saraid/rugged,libgit2/rugged,spraints/rugged,Acidburn0zzz/rugged,libgit2/rugged,saraid/rugged,libgit2/rugged,spraints/rugged,Acidburn0zzz/rugged,tpickett66/rugged,tpickett66/rugged,saraid/rugged,tpickett66/rugged,Acidburn0zzz/rugged