[pygobject] Remove pre-commit.hook

[Christoph Reiter <creiter src gnome org>]

commit 9462873823a5459276400c0d6cf11e084b681751
Author: Christoph Reiter <creiter src gnome org>
Date:   Wed Dec 6 15:55:54 2017 +0100

    Remove pre-commit.hook
    
    It was obviously not used in some time as the git command doesn't exist anymore.
    If we ever get per pull/merge request CI we can look into bringing something
    like this back.

 MANIFEST.in     |    1 -
 pre-commit.hook |   39 ---------------------------------------
 2 files changed, 0 insertions(+), 40 deletions(-)
---
diff --git a/MANIFEST.in b/MANIFEST.in
index 26b2abd..ce35115 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -9,7 +9,6 @@ include INSTALL
 include m4/introspection.m4
 include m4/python.m4
 include NEWS
-include pre-commit.hook
 include pygi-convert.sh
 include pygobject.doap
 include README