Build i386.rpm libgomp as i486+, pre-i486 hardware isn't supported
because NPTL doesn't support it anyway.

--- libgomp/configure.tgt.jj	2008-01-10 20:53:48.000000000 +0100
+++ libgomp/configure.tgt	2008-03-27 12:44:51.000000000 +0100
@@ -39,10 +39,10 @@ if test $enable_linux_futex = yes; then
 	;;
 
     # Note that bare i386 is not included here.  We need cmpxchg.
-    i[456]86-*-linux*)
+    i[3456]86-*-linux*)
 	config_path="linux/x86 linux posix"
 	if test -z "$with_arch"; then
-	  XCFLAGS="${XCFLAGS} -march=i486 -mtune=${target_cpu}"
+	  XCFLAGS="${XCFLAGS} -march=i486 -mtune=generic"
 	fi
 	;;
 
@@ -53,7 +53,7 @@ if test $enable_linux_futex = yes; then
 	config_path="linux/x86 linux posix"
 	case " ${CC} ${CFLAGS} " in
 	  *" -m32 "*)
-	    XCFLAGS="${XCFLAGS} -march=i486 -mtune=i686"
+	    XCFLAGS="${XCFLAGS} -march=i486 -mtune=generic"
 	    ;;
 	esac
 	;;