[glib] Don't enable libmount by default for now

[Mario Sanchez Prada <msanchez src gnome org>]

commit fbf72a31b13159cef980f17e711dd7600c08176e
Author: Mario Sanchez Prada <mario endlessm com>
Date:   Thu Jul 28 11:56:39 2016 -0600

    Don't enable libmount by default for now
    
    This is causing trouble with flatpaks because the org.gnome.Platform
    runtime does not bundle libmount, while the org.gnome.Sdk does it.
    
    As this probably requires a change in the freedesktop.org Yocto base,
    we disable this support by default for now as a temporary measure
    until it can be properly reviewed by someone who knows those bits
    better, probably Alex Larsson.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769284

 configure.ac |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f704057..7e3aa39 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1733,9 +1733,12 @@ fi
 dnl ************************
 dnl *** check for libmount ***
 dnl ************************
-AC_ARG_ENABLE(mount,
-              AS_HELP_STRING([--disable-libmount], [build without libmount support]))
-AS_IF([ test "x$enable_libmount" != "xno"],[
+AC_ARG_ENABLE(libmount,
+              [AS_HELP_STRING([--enable-libmount],
+                              [build with libmount support [default=no]])],,
+              [enable_libmount=no])
+
+AS_IF([ test "x$enable_libmount" = "xyes"],[
 PKG_CHECK_MODULES([LIBMOUNT], [mount >= 2.28], [have_libmount=yes], [have_libmount=maybe])
 AS_IF([ test $have_libmount = maybe ], [
   glib_save_LIBS=$LIBS