Move sparc away from the deprecated inifini.c scheme.

/

	* sysdeps/sparc/Makefile: Add -fPIC when building crt{i,n}.S
	* sysdeps/sparc/crti.S: New file.
	* sysdeps/sparc/crtn.S: New file.
	* sysdeps/sparc/sparc32/Makefile: Remove initfini handling.
	* sysdeps/sparc/sparc64/Makefile: Likewise.

nptl/

	* sysdeps/sparc/Makefile: Add -fPIC when building pt-crti.S and crtn.S