Handle more _FloatN, _FloatNx types in bits/libm-simd-decl-stubs.h.

Handle more _FloatN, _FloatNx types in bits/libm-simd-decl-stubs.h.

This patch adds the macro definitions to bits/libm-simd-decl-stubs.h
required to handle additional _FloatN and _FloatNx types.

Tested for x86_64, including in conjunction with _Float64x support
patches.

	* bits/libm-simd-decl-stubs.h (__DECL_SIMD_cosf16): New macro.
	(__DECL_SIMD_cosf32): Likewise.
	(__DECL_SIMD_cosf64): Likewise.
	(__DECL_SIMD_cosf32x): Likewise.
	(__DECL_SIMD_cosf64x): Likewise.
	(__DECL_SIMD_cosf128x): Likewise.
	(__DECL_SIMD_sinf16): Likewise.
	(__DECL_SIMD_sinf32): Likewise.
	(__DECL_SIMD_sinf64): Likewise.
	(__DECL_SIMD_sinf32x): Likewise.
	(__DECL_SIMD_sinf64x): Likewise.
	(__DECL_SIMD_sinf128x): Likewise.
	(__DECL_SIMD_sincosf16): Likewise.
	(__DECL_SIMD_sincosf32): Likewise.
	(__DECL_SIMD_sincosf64): Likewise.
	(__DECL_SIMD_sincosf32x): Likewise.
	(__DECL_SIMD_sincosf64x): Likewise.
	(__DECL_SIMD_sincosf128x): Likewise.
	(__DECL_SIMD_logf16): Likewise.
	(__DECL_SIMD_logf32): Likewise.
	(__DECL_SIMD_logf64): Likewise.
	(__DECL_SIMD_logf32x): Likewise.
	(__DECL_SIMD_logf64x): Likewise.
	(__DECL_SIMD_logf128x): Likewise.
	(__DECL_SIMD_expf16): Likewise.
	(__DECL_SIMD_expf32): Likewise.
	(__DECL_SIMD_expf64): Likewise.
	(__DECL_SIMD_expf32x): Likewise.
	(__DECL_SIMD_expf64x): Likewise.
	(__DECL_SIMD_expf128x): Likewise.
	(__DECL_SIMD_powf16): Likewise.
	(__DECL_SIMD_powf32): Likewise.
	(__DECL_SIMD_powf64): Likewise.
	(__DECL_SIMD_powf32x): Likewise.
	(__DECL_SIMD_powf64x): Likewise.
	(__DECL_SIMD_powf128x): Likewise.