darwin-user: Use GCC_FMT_ATTR (format checking)

The redundant forward declaration of qerror in machload.c
is removed because it should be taken from qemu.h.

Please note that this patch is untested because
I have no matching environment to compile it.

Cc: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/darwin-user/machload.c b/darwin-user/machload.c
index 4bb5c72..3bc3b65 100644
--- a/darwin-user/machload.c
+++ b/darwin-user/machload.c
@@ -82,7 +82,7 @@
 int   macho_offset = 0;
 
 int load_object(const char *filename, struct target_pt_regs * regs, void ** mh);
-void qerror(const char *format, ...);
+
 #ifdef TARGET_I386
 typedef struct mach_i386_thread_state {
     unsigned int    eax;