[gnome-builder] autotools: Use LANG=C.UTF-8 rather than LANG=C

[Christian Hergert <chergert src gnome org>]

commit ce3f740e9493e22e93eacabf8c7057624e3bdf03
Author: Philip Withnall <withnall endlessm com>
Date:   Wed Jul 11 10:54:43 2018 +0200

    autotools: Use LANG=C.UTF-8 rather than LANG=C
    
    Various processes run as part of `make all` for typical projects will
    end up giving output full of replacement characters, or crashing, if run
    in an ASCII locale. Explicitly run them in a UTF-8 locale to avoid that.
    
    This assumes (I haven’t verified) that the code in Builder which parses
    the `make all` output is UTF-8–safe.
    
    See https://gitlab.gnome.org/GNOME/glib/issues/1430.
    
    Signed-off-by: Philip Withnall <withnall endlessm com>

 src/plugins/autotools/ide-autotools-make-stage.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/plugins/autotools/ide-autotools-make-stage.c 
b/src/plugins/autotools/ide-autotools-make-stage.c
index a9d5900f8..a180e294c 100644
--- a/src/plugins/autotools/ide-autotools-make-stage.c
+++ b/src/plugins/autotools/ide-autotools-make-stage.c
@@ -138,9 +138,9 @@ create_launcher (IdeAutotoolsMakeStage  *self,
    */
   if (dzl_str_equal0 ("all", make_target))
     {
-      ide_subprocess_launcher_setenv (launcher, "LANG", "C", TRUE);
-      ide_subprocess_launcher_setenv (launcher, "LC_ALL", "C", TRUE);
-      ide_subprocess_launcher_setenv (launcher, "LC_MESSAGES", "C", TRUE);
+      ide_subprocess_launcher_setenv (launcher, "LANG", "C.UTF-8", TRUE);
+      ide_subprocess_launcher_setenv (launcher, "LC_ALL", "C.UTF-8", TRUE);
+      ide_subprocess_launcher_setenv (launcher, "LC_MESSAGES", "C.UTF-8", TRUE);
     }
 
   return g_steal_pointer (&launcher);