sim: drop core libiberty.h include

This doesn't need to be included for every sim file, so drop it.
Every C file that needs it seems to already include it.

sim/common/ChangeLog

@@ -1,3 +1,7 @@
+2021-06-18  Mike Frysinger  <vapier@gentoo.org>
+
+	* sim-basics.h: Delete libiberty.h include.
+
 2021-06-17  Mike Frysinger  <vapier@gentoo.org>
 
 	* Make-common.in (SIM_ENDIAN): Delete.

sim/common/sim-basics.h

@@ -125,8 +125,6 @@ typedef enum {
 
 #include "sim-utils.h"
 
-#include "libiberty.h"
-
 /* Note: Only the simpler interfaces are defined here.  More heavy
    weight objects, such as core and events, are defined in the more
    serious sim-base.h header. */