sim: ppc: fix bad AC_CACHE_CHECK call with semun

The first arg is the cache var name, and this one was typoed relative
to what the call actually set.  We also don't need the manual call to
AC_MSG_RESULT as the AC_CACHE_CHECK takes care of it for us.

sim/ppc/configure

@@ -3144,7 +3144,7 @@ fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking if union semun defined" >&5
 $as_echo_n "checking if union semun defined... " >&6; }
-if ${ac_cv_HAS_UNION_SEMUN+:} false; then :
+if ${ac_cv_has_union_semun+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -3167,13 +3167,10 @@ else
   ac_cv_has_union_semun="no"
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_has_union_semun" >&5
 $as_echo "$ac_cv_has_union_semun" >&6; }
 
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_HAS_UNION_SEMUN" >&5
-$as_echo "$ac_cv_HAS_UNION_SEMUN" >&6; }
-
 
 if test "$ac_cv_has_union_semun" = "yes"; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether System V semaphores are supported" >&5

sim/ppc/configure.ac

@@ -97,16 +97,14 @@ esac
 ])dnl
 
 AC_CACHE_CHECK([if union semun defined],
-  ac_cv_HAS_UNION_SEMUN,
+  [ac_cv_has_union_semun],
   [AC_TRY_COMPILE([
 #include <sys/types.h>
 #include <sys/ipc.h>
 #include <sys/sem.h>],
 [union semun arg ;],
 [ac_cv_has_union_semun="yes"],
-[ac_cv_has_union_semun="no"])
-AC_MSG_RESULT($ac_cv_has_union_semun)
-])
+[ac_cv_has_union_semun="no"])])
 
 
 if test "$ac_cv_has_union_semun" = "yes"; then