Per-machine additions to CFLAGS-rtld.c being overridden.

[Siddhesh Poyarekar]

On Tue, Jan 08, 2013 at 11:07:53PM +0530, Siddhesh Poyarekar wrote:
> 
> CFLAGS-rtld.c = $(SYSCONF-FLAGS) $(CFLAGS-rtld.c)
> 

Oh that doesn't work - make doesn't like it.  Appending is the best
idea here and safe enough since an architecure wouldn't want to
override $(SYSCONF-FLAGS).  Long term, we move Makeconfig down - looks
pretty dicey to me at first glance, but maybe it's doable.

Siddhesh