util: Build m5 with -no-pie flag

Added -no-pie flag to link /util/m5 to support newer versions of GCC 
that enable PIE by default. Tested for backwards compatibility with GCC 
4.3, which, only warns for the unrecognized flag.

Change-Id: I4b6df593936346b9d3e2fe29a5d85dde78b7cc5e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17429
Reviewed-by: Gabe Black <gabeblack@google.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
diff --git a/util/m5/Makefile.x86 b/util/m5/Makefile.x86
index 89f8f92..c108ef6 100644
--- a/util/m5/Makefile.x86
+++ b/util/m5/Makefile.x86
@@ -51,7 +51,7 @@
 	$(CC) $(CFLAGS) -fPIC -o $@ -c $<
 m5: $(OBJS)
-	$(CC) -o $@ $(OBJS)
+	$(CC) -o $@ $(OBJS) -no-pie
 m5op_x86.opic: m5op_x86.S
 	$(CC) $(CFLAGS) -DM5OP_PIC -fPIC -o $@ -c $<