[glibmm] tools/gen_scripts: Update for non-source-dir builds of glibmm

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 896778648bddccb343946dcc48626c0a207035b8
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Thu Jan 3 18:29:46 2019 +0100

    tools/gen_scripts: Update for non-source-dir builds of glibmm
    
    jhbuild/modulesets/gnome-suites-core-deps-latest.modules has been changed
    to allow jhbuild to build glibmm with builddir != sourcedir.

 tools/gen_scripts/init_generate.sh | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/tools/gen_scripts/init_generate.sh b/tools/gen_scripts/init_generate.sh
index d0d81f7c..5ce3895e 100755
--- a/tools/gen_scripts/init_generate.sh
+++ b/tools/gen_scripts/init_generate.sh
@@ -36,9 +36,8 @@ gen_enums="$GMMPROC_GEN_SOURCE_DIR/glibmm/tools/enum.pl"
 
 # Where to find executables that generate extra defs (signals and properties).
 # glibmm is built with autotools.
-# autotools support non-source-dir builds, but glibmm does not.
-# See the glibmm entry in jhbuild's modulesets files.
-extra_defs_gen_dir="$GMMPROC_GEN_SOURCE_DIR/glibmm/tools/extra_defs_gen"
+# autotools support, but don't require, non-source-dir builds.
+extra_defs_gen_dir="$GMMPROC_GEN_BUILD_DIR/glibmm/tools/extra_defs_gen"
 
 source_prefix="$GMMPROC_GEN_SOURCE_DIR/glib"
 build_prefix="$GMMPROC_GEN_BUILD_DIR/glib"