[libc][math] Refactor exp10 implementation to header-only in src/__support/math folder.

Author: bassiounix

libc/src/math/generic/common_constants.h

@@ -13,8 +13,6 @@
 #include "src/__support/macros/config.h"
 #include "src/__support/math/exp_constants.h"
 #include "src/__support/number_pair.h"
-#include "src/__support/math/exp_constants.h"
-#include "src/__support/number_pair.h"
 
 namespace LIBC_NAMESPACE_DECL {