Fix sparc build after math_private.h cleanups.

Fix sparc build after math_private.h cleanups.

	* sysdeps/sparc/fpu/fenv_private.h: New file.
	* sysdeps/sparc/fpu/math_private.h: Use it.
	(libc_feholdexcept, libc_feholdexceptf, libc_feholdexceptl):
	Remove.
	(libc_feholdexcept_setround, libc_feholdexcept_setroundf,
	(libc_feholdexcept_setroundl): Remove.
	(libc_fetestexcept, libc_fetestexceptf, libc_fetestexceptl):
	Remove.
	(libc_fesetenv, libc_fesetenvf, libc_fesetenvl): Remove.
	(libc_feupdateenv, libc_feupdateenvf, libc_feupdateenvf): Remove.