[RFC 11/23] Drop regset_alloc()

[Mark Kettenis]

> From: Andreas Arnez <arnez@linux.vnet.ibm.com>
> Date: Mon, 28 Apr 2014 11:53:16 +0200
> 
> Now that all invocations of regset_alloc() have been removed, the
> function is dropped.  Since regset_alloc() was the only function
> provided by regset.c, this source file is removed as well.
> 
> gdb/
> 	* Makefile.in (SFILES): Delete "regset.c".
> 	(COMMON_OBS): Delete "regset.o".
> 	* regset.c: Remove.
> 	* regset.h (regset_alloc): Delete prototype.

ok (once all the other diffs have been approved of course)