www/rubygem-passenger: Fix PLIST issue

from poudriere (with -t flag):
[00:03:27] [02] [00:00:00] Building www/rubygem-passenger@apache | rubygem-passenger-apache-6.0.12_1
[00:07:27] [02] [00:04:00] Finished www/rubygem-passenger@apache | rubygem-passenger-apache-6.0.12_1: Failed: check-plist

from poudriere build log:
====> Checking for pkg-plist issues (check-plist)
===> Parsing plist
===> Checking for items in STAGEDIR missing from pkg-plist
Error: Orphaned: bin/%%AP_NAME%%-install-apache2-module
Error: Orphaned: bin/%%AP_NAME%%-install-nginx-module
===> Checking for items in pkg-plist which are not in STAGEDIR
===> Error: Plist issues found.
*** Error code 1

Stop.
make: stopped in /usr/ports/www/rubygem-passenger
=>> Error: check-plist failures detected
=>> Cleaning up wrkdir
===>  Cleaning for rubygem-passenger-apache-6.0.12_1

Approved by:	portmgr (blanket)

www/rubygem-passenger/Makefile

@@ -105,6 +105,8 @@ post-install:
 	${LN} -sf ../../${GEM_LIB_DIR}/buildout/apache2/mod_passenger.so ${STAGEDIR}${PREFIX}/${APACHEMODDIR}/mod_passenger.so
 	@${ECHO} "${APACHEMODDIR}/mod_passenger.so" >> ${TMPPLIST}
 .endif
+	@${RM} ${STAGEDIR}${PREFIX}/bin/passenger-install-apache2-module \
+		${STAGEDIR}${PREFIX}/bin/passenger-install-nginx-module
 	@${RM} ${STAGEDIR}${PREFIX}/${GEM_LIB_DIR}/bin/passenger-install-apache2-module \
 		${STAGEDIR}${PREFIX}/${GEM_LIB_DIR}/bin/passenger-install-nginx-module