package/apparmor: fix per-package build with apache

Fix the following per-package build failure with apache:

/home/buildroot/autobuild/instance-3/output-1/per-package/apparmor/host/aarch64-buildroot-linux-gnu/sysroot/usr/bin/../../usr/build-1/libtool --silent --mode=link /home/buildroot/autobuild/instance-3/output-1/per-package/apparmor/host/bin/aarch64-linux-gcc    -o mod_apparmor.la  -rpath /usr/modules -module -avoid-version    mod_apparmor.lo -L/home/buildroot/autobuild/instance-3/output-1/per-package/apparmor/host/bin/../aarch64-buildroot-linux-gnu/sysroot/usr/lib -lapparmor
/home/buildroot/autobuild/instance-3/output-1/per-package/apache/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-buildroot-linux-gnu/9.3.0/../../../../aarch64-buildroot-linux-gnu/bin/ld: cannot find /lib64/libc.so.6

This build failure is raised because the fix added by commit
3c836e54203b16015c9c52cbe007adc92d293a0d was incomplete as the apr
special libtool script was not patched (see commit
b747c29c4e8eb89b7b99658dfd34f4a6b6b0744d for a detailled explanation)

Fixes:
 - http://autobuild.buildroot.org/results/6747b1cb11b129ea4bcb1ecc9645e94fb8e095e8

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 8bd40a0303c697822f2c65b4ede80ad1252bbc07)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/apparmor/apparmor.mk

@@ -59,7 +59,8 @@ ifeq ($(BR2_PER_PACKAGE_DIRECTORIES),y)
 define APPARMOR_FIXUP_APXS
 	$(SED) "s@$(PER_PACKAGE_DIR)/[^/]\+/@$(PER_PACKAGE_DIR)/apparmor/@g" \
 		$(STAGING_DIR)/usr/bin/apxs \
-		$(STAGING_DIR)/usr/build/config_vars.mk
+		$(STAGING_DIR)/usr/build/config_vars.mk \
+		$(STAGING_DIR)/usr/build-1/libtool
 endef
 APPARMOR_POST_CONFIGURE_HOOKS += APPARMOR_FIXUP_APXS
 endif