[gedit] build: use 'foreign' in automake init

[Sébastien Lafargue <slafargue src gnome org>]

commit 4edb85d7ffa22d42cb5dde13fe4df639810db818
Author: Sebastien Lafargue <slafargue gnome org>
Date:   Tue Dec 4 19:10:32 2018 +0100

    build: use 'foreign' in automake init
    
    Since we have replaced README by README.md,
    automake need to be aware of that:
    
    Makefile.am: error: required file './README' not found

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 3074d8600..4b61eeccc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,7 +36,7 @@ AC_SUBST(GEDIT_MINOR_VERSION, gedit_minor_version)
 AC_DEFINE(GEDIT_MICRO_VERSION, gedit_micro_version, [Gedit micro version])
 AC_SUBST(GEDIT_MICRO_VERSION, gedit_micro_version)
 
-AM_INIT_AUTOMAKE([1.11 tar-ustar dist-xz no-dist-gzip -Wno-portability subdir-objects])
+AM_INIT_AUTOMAKE([1.11 tar-ustar dist-xz no-dist-gzip -Wno-portability subdir-objects foreign])
 AM_MAINTAINER_MODE([enable])
 
 AM_SILENT_RULES([yes])