[mutter] configure.ac: explicitly set link_all_deplibs=yes

[Marco Trevisan <marcotrevi src gnome org>]

commit 177e47952af794bc503835bf66c87bea282c9bc9
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Mon May 22 04:39:24 2017 +0000

    configure.ac: explicitly set link_all_deplibs=yes
    
    Some distros such as Ubuntu and Debian set it to 'no',
    while others might keep it to 'unknown' (which defaults to
    'yes'). And this causes troubles when linking with mutter-clutter
    in some tests.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=782821

 configure.ac |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 0436925..883b74a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -57,6 +57,13 @@ AM_GNU_GETTEXT([external])
 
 LT_PREREQ([2.2.6])
 LT_INIT([disable-static])
+
+# Debian / Ubuntu set this flag to 'no' in libtool, causing linking errors
+# (i.e when linking against mutter-clutter). Not to explicitly redefine such
+# deps, we enable this flag for everybody.
+link_all_deplibs=yes
+link_all_deplibs_CXX=yes
+
 AC_PROG_CC
 AC_PROG_CC_C_O
 AC_PROG_INSTALL