Fix sincos errno setting (bug 15467).

Fix sincos errno setting (bug 15467).

This patch makes sincos set errno to EDOM when passed an infinity,
similarly to sin and cos.

Tested for x86_64, x86, powerpc and mips64.  I don't know if the
architecture-specific implementations for ia64 and m68k might need
corresponding fixes.

2015-02-11  Joseph Myers  <joseph@codesourcery.com>

	[BZ #15467]
	* sysdeps/ieee754/dbl-64/s_sincos.c: Include <errno.h>.
	(__sincos): Set errno to EDOM for infinite argument.
	* sysdeps/ieee754/flt-32/s_sincosf.c: Include <errno.h>.
	(SINCOSF_FUNC): Set errno to EDOM for infinite argument.
	* sysdeps/ieee754/ldbl-128/s_sincosl.c: Include <errno.h>.
	(__sincosl): Set errno to EDOM for infinite argument.
	* sysdeps/ieee754/ldbl-128ibm/s_sincosl.c: Include <errno.h>.
	(__sincosl): Set errno to EDOM for infinite argument.
	* sysdeps/ieee754/ldbl-96/s_sincosl.c: Include <errno.h>.
	(__sincosl): Set errno to EDOM for infinite argument.
	* math/libm-test.inc (sincos_test_data): Test errno setting.