[recipes] Drop one libgd submodule

[Matthias Clasen <matthiasc src gnome org>]

commit 152f3550e0d2200d2b1bc13e83d9cceb4ca94d8a
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Mar 17 17:54:08 2017 -0400

    Drop one libgd submodule
    
    This submodule was used for autotools, the meson build
    is using the submodule in subprojects/

 .gitmodules |    3 ---
 libgd       |    1 -
 2 files changed, 0 insertions(+), 4 deletions(-)
---
diff --git a/.gitmodules b/.gitmodules
index 5deb59b..e91a9d2 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,3 @@
-[submodule "libgd"]
-       path = libgd
-       url = git://git.gnome.org/libgd
 [submodule "subprojects/libgd"]
        path = subprojects/libgd
        url = git://git.gnome.org/libgd