Generate a tgz file instead of a .tar.gz file (expected by Zope.org).

inst/Makefile.in

@@ -119,7 +119,7 @@ sdist_tgz:
           "${BASE_DIR}/lib/python/version.txt"
 	${MKDIR} ${TMPDIR}
 	${CD} ${TMPDIR} && ${LN} ${BASE_DIR} ${PACKAGE_NAME} && \
-          ${TAR} czfh ${BASE_DIR}/${PACKAGE_NAME}.tar.gz ${PACKAGE_NAME} \
+          ${TAR} czfh ${BASE_DIR}/${PACKAGE_NAME}.tgz ${PACKAGE_NAME} \
            --exclude=${PACKAGE_NAME}.tar.gz\
            --exclude=CVS \
            --exclude=.cvsignore \