[recipes] Drop libglnx submodule

[Matthias Clasen <matthiasc src gnome org>]

commit 9a6266a61d4685090eec06c97ae4ae3e06aaa783
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Feb 16 19:05:25 2017 -0500

    Drop libglnx submodule
    
    We are not using it anymore.

 .gitmodules |    3 ---
 libglnx     |    1 -
 2 files changed, 0 insertions(+), 4 deletions(-)
---
diff --git a/.gitmodules b/.gitmodules
index 6822a49..bfd964e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,3 @@
 [submodule "libgd"]
        path = libgd
        url = git://git.gnome.org/libgd
-[submodule "libglnx"]
-       path = libglnx
-       url = https://git.gnome.org/browse/libglnx