Delete everything under sysdeps/unix/sparc/

Delete everything under sysdeps/unix/sparc/

	* sysdeps/unix/sparc/brk.S: Delete.
	* sysdeps/unix/sparc/dl-brk.S: Delete.
	* sysdeps/unix/sparc/pipe.S: Delete.
	* sysdeps/unix/sparc/sysdep.S: Delete.
	* sysdeps/unix/sparc/sysdep.h: Delete.
	* sysdeps/unix/sparc/vfork.S: Delete.
	* sysdeps/sparc/sysdep.h (SPARC_PIC_THUNK, SPARC_PIC_REG,
	SPARC_PIC_REG_LEAF, ENTRY, END, LOC): Define.
	* sysdeps/unix/sysv/linux/sparc/sysdep.h (ret, ret_NOERRNO,
	ret_ERRVAL, r0, r1, MOVE): Define.
	(JUMPTARGET): Remove.
	* sysdeps/unix/sysv/linux/sparc/sparc32/sysdep.h: Don't include
	sysdeps/unix/sparc/sysdep.h
	(ENTRY, END): Remove.
	* sysdeps/unix/sysv/linux/sparc/sparc64/sysdep.h: Likewise.