Don't rely on a shell scripts to do the simple job of loading

kernel modules for ibcs2_enable and svr4_enable.

Don't rely on a shell script to do the neglibly less simple
job of loading a kernel module and running one command for
linux_enable.

These shell scripts are going away.

etc/etc.amd64/rc.amd64

@@ -31,8 +31,17 @@ esac
 #
 case ${ibcs2_enable} in
 [Yy][Ee][Ss])
-	echo -n ' ibcs2';	ibcs2 > /dev/null 2>&1
-	;;
+	echo -n ' ibcs2'
+	kldload ibcs2 > /dev/null 2>&1
+	case ${ibcs2_loaders} in
+	[Nn][Oo])
+		;;
+	*)
+		for i in ${ibcs2_loaders}; do
+			kldload ibcs2_$i > /dev/null 2>&1
+		done
+		;;
+	esac
 esac
 
 case ${xtend_enable} in

etc/etc.i386/rc.i386

@@ -31,8 +31,17 @@ esac
 #
 case ${ibcs2_enable} in
 [Yy][Ee][Ss])
-	echo -n ' ibcs2';	ibcs2 > /dev/null 2>&1
-	;;
+	echo -n ' ibcs2'
+	kldload ibcs2 > /dev/null 2>&1
+	case ${ibcs2_loaders} in
+	[Nn][Oo])
+		;;
+	*)
+		for i in ${ibcs2_loaders}; do
+			kldload ibcs2_$i > /dev/null 2>&1
+		done
+		;;
+	esac
 esac
 
 case ${xtend_enable} in

etc/rc

@@ -548,7 +548,13 @@ fi
 #
 case ${linux_enable} in
 [Yy][Ee][Ss])
-	echo -n ' linux';	linux > /dev/null 2>&1
+	echo -n ' linux'
+	if ! kldstat -v | grep -E 'linux(aout|elf)' > /dev/null; then
+		kldload linux > /dev/null 2>&1
+	fi
+	if [ -x /compat/linux/sbin/ldconfig ]; then
+		/compat/linux/sbin/ldconfig
+	fi
 	;;
 esac
 
@@ -556,7 +562,7 @@ esac
 #
 case ${svr4_enable} in
 [Yy][Ee][Ss])
-	echo -n ' svr4';	svr4 > /dev/null 2>&1
+	echo -n ' svr4';	kldload svr4 > /dev/null 2>&1
 	;;
 esac