Dependency generation fixes

[Roland McGrath]

> Tested natively on ppc-linux and with a ppc->m68k-linux cross.
> 
> Andreas.
> 
> 2003-05-11  Andreas Schwab  <schwab@suse.de>
> 
> 	* Makerules: Always use -MP together with -MD.
> 	(set-remove-dotot): Substitute $(..) also at start of line.
> 	($(stdio_lim:h=st)): Use -MD instead of SUNPRO_DEPENDENCIES.
> 	Generated defines with a single compiler call.  Use
> 	$(sed-remove-dotdot).
> 	* mach/Makefile ($(objpfx)mach-syscalls.mk): Use -MD instead
> 	of DEPENDENCIES_OUTPUT, and use $(sed-remove-objpfx).
> 	* sysdeps/unix/sysv/linux/Makefile ($(objpfx)syscall-%.h):
> 	Use -MD instead of SUNPRO_DEPENDENCIES, and use
> 	$(sed-remove-objpfx).
> 	* sysdeps/unix/sysv/linux/mips/Makefile
> 	($(objpfx)syscall-%.h): Likewise.

I put these in.


Thanks,
Roland