\+ is a GNU sed extension - not available on MacOS X

also support a MySQL/MariaDB client lib link line without any "-L"

Change-Id: I1c2bc13f35a33c0f62f0d23d0982d5977aafe2c3

configure.ac

@@ -8278,7 +8278,7 @@ if test "$ENABLE_MARIADBC" = "TRUE"; then
         if test "$enable_bundle_mariadb" = "yes"; then
             AC_MSG_RESULT([yes])
             BUNDLE_MARIADB=TRUE
-            LIBMARIADB=lib$(echo "${MARIADB_LIBS}" | sed -e 's/[[[:space:]]]\+-l/\n/g' | grep -E '(mysqlclient|mariadb)')
+            LIBMARIADB=lib$(echo "${MARIADB_LIBS}" | sed -e 's/[[[:space:]]]\{1,\}-l/\n/g' -e 's/^-l/\n/g' | grep -E '(mysqlclient|mariadb)')
             if test "$_os" = "Darwin"; then
                 LIBMARIADB=${LIBMARIADB}.dylib
             elif test "$_os" = "WINNT"; then