[glom] Build: Require gtkmm-3.22 (and therefore gtk+-3.22)

[Murray Cumming <murrayc src gnome org>]

commit 0bc8bf73f10acf661a39d221bfda556d8dc8d46f
Author: Murray Cumming <murrayc murrayc com>
Date:   Wed Jun 21 08:36:39 2017 +0200

    Build: Require gtkmm-3.22 (and therefore gtk+-3.22)
    
    Because that is the current version, and that makes it easier to
    build against the not-deprecated API.

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index dfb1f642..2979fe4f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -169,7 +169,7 @@ AS_IF([test "x$glom_host_win32" != xyes],
       [REQUIRED_LIBGLOM_LIBS="$REQUIRED_LIBGLOM_LIBS libepc-1.0 >= 0.4.0"])
 
 # Libraries used by Glom:
-REQUIRED_GLOM_LIBS="$REQUIRED_LIBGLOM_LIBS gtkmm-3.0 >= 3.18.0 sigc++-2.0 >= 2.9.2 goocanvasmm-2.0 >= 
1.90.11 goocanvas-2.0 >= 2.0.1 evince-view-3.0"
+REQUIRED_GLOM_LIBS="$REQUIRED_LIBGLOM_LIBS gtkmm-3.0 >= 3.22.0 sigc++-2.0 >= 2.9.2 goocanvasmm-2.0 >= 
1.90.11 goocanvas-2.0 >= 2.0.1 evince-view-3.0"
 
 # Do not require iso-codes in client-only mode, or on Windows:
 # TODO: Package iso-codes for Windows?