Remove duplicate inclusion of header math-svid-compat.h

The header math-svid-compat.h has been unintentionally included twice in
the wrappers for the remainder functions.  This patch removes the
duplicate inclusions.

	* math/w_remainder_compat.c: Remove duplicate inclusion of
	math-svid-compat.h.
	* math/w_remainderf_compat.c: Likewise.
	* math/w_remainderl_compat.c: Likewise.