kgdbts: only use new asm-generic/ptrace.h api when needed

The new instruction_pointer_set helper is defined for people who have
converted to asm-generic/ptrace.h, so don't use it generally unless
the arch needs it (in which case it has been converted).  This should
fix building of kgdb tests for arches not yet converted.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Jason Wessel <jason.wessel@windriver.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/misc/kgdbts.c

@@ -304,7 +304,10 @@ static int check_and_rewind_pc(char *put_str, char *arg)
 		return 1;
 	}
 	/* Readjust the instruction pointer if needed */
-	instruction_pointer_set(&kgdbts_regs, ip + offset);
+	ip += offset;
+#ifdef GDB_ADJUSTS_BREAK_OFFSET
+	instruction_pointer_set(&kgdbts_regs, ip);
+#endif
 	return 0;
 }