[totem] build: Fix ChangeLog generation with srcdir != builddir

[Bastien Nocera <hadess src gnome org>]

commit 4d321c197c907d37b5c59560f4b3cbb8f7e8de45
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Aug 30 17:50:39 2016 +0200

    build: Fix ChangeLog generation with srcdir != builddir
    
    As done in jhbuild.

 Makefile.am |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 5cc5e53..fade4da 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -40,7 +40,9 @@ DISTCHECK_CONFIGURE_FLAGS = \
 # Build ChangeLog from GIT history
 ChangeLog:
        @if test -f $(top_srcdir)/.git/HEAD; then \
+               pushd $(top_srcdir) ; \
                git log --stat --after="Mon Jul 20 23:47:57 2009" > $@; \
+               popd ; \
        fi
 
 dist: ChangeLog