build/packages: allow easy purge even with wildcard

Use with care, but can be useful.  '*' does not pass easily so
let's use '%' instead.

build/common.sh

@@ -861,6 +861,7 @@ remove_packages()
 	echo ">>> Removing packages in ${BASEDIR}: ${PKGLIST}"
 
 	for PKG in ${PKGLIST}; do
+		PKG=$(echo ${PKG} | tr '%' '*')
 		for PKGFILE in $(cd ${BASEDIR}${PACKAGESDIR}; \
 		    find All -name "${PKG}-[0-9]*.pkg" -type f); do
 			rm ${BASEDIR}${PACKAGESDIR}/${PKGFILE}

build/packages.sh

@@ -41,6 +41,7 @@ AUXLIST=$(list_packages "${AUXLIST}" ${CONFIGDIR}/aux.conf)
 setup_stage ${STAGEDIR}
 setup_base ${STAGEDIR}
 extract_packages ${STAGEDIR}
+remove_packages ${STAGEDIR} ${@}
 
 # The goal for aux packages is that they are part of the packages
 # set for nightly builds until they are officially built using the