[PATCH] sim: constify sim_write source buffer

[Sandra Loosemore]

FYI, this patch:

2010-04-13  Mike Frysinger  <vapier@gentoo.org>

	* remote-sim.h (sim_write): Add const to buf arg.

caused the ARM simulator to fail to build.  See sim/arm/wrapper.c:158:

int
sim_write (sd, addr, buffer, size)
      SIM_DESC sd ATTRIBUTE_UNUSED;
      SIM_ADDR addr;
      unsigned char * buffer;
      int size;

The obvious patch makes it build, at least.

-Sandra