* gdb.base/call-signal-resume.exp, gdb.base/unwindonsignal.exp: Skip

if gdb,nosignals.
	* gdb.base/watchpoints.c: Do not include unnecessary headers.
	* lib/gdb.exp (gdb_test_multiple): Relax pattern for "the program
	exited".

gdb/testsuite/gdb.base/watchpoints.c

@@ -21,9 +21,6 @@
 /* This source is mainly to test what happens when a watchpoint is
    removed while another watchpoint, inserted later is left active.  */
 
-#include <stdio.h>
-#include <unistd.h>
-
 int count = -1;
 int ival1 = -1;
 int ival2 = -1;