fix shell typo

mk/pkg-bottom.mk

@@ -184,7 +184,7 @@ ifneq (,$(filter dev,${PKG_OPTS}))
 	done
 endif
 	@-cd ${WRKINST}; \
-	    if [ "${PKG_NAME}" != "uClibc" -a "${PKG_NAME}" != "glibc" -a "${PKG_NAME}" != "libpthread" -a "${PKG_NAME}" != "libstdcxx" -a -a "${PKG_NAME}" != "libthread-db" -a "${PKG_NAME}" != "musl" -a "${PKG_NAME}" != "pam" -a "${PKG_NAME}" != "tzdata" ];then \
+	    if [ "${PKG_NAME}" != "uClibc" -a "${PKG_NAME}" != "glibc" -a "${PKG_NAME}" != "libpthread" -a "${PKG_NAME}" != "libstdcxx" -a "${PKG_NAME}" != "libthread-db" -a "${PKG_NAME}" != "musl" -a "${PKG_NAME}" != "pam" -a "${PKG_NAME}" != "tzdata" ];then \
 	    find lib \( -name lib\*.so\* -o -name lib\*.a \) \
 	    	-exec echo 'WARNING: ${PKG_NAME} installs files in /lib -' \
 		' fix this!' >&2 \; -quit 2>/dev/null; fi;\