[gtk-vnc] Fix generation of ChangeLog with VPATH build

[Daniel P. Berrange <dberrange src gnome org>]

commit 88cbe11c0fa4f00bef401577499f996d08f86550
Author: Daniel P. Berrange <berrange redhat com>
Date:   Wed Sep 18 12:08:04 2013 +0100

    Fix generation of ChangeLog with VPATH build
    
    Signed-off-by: Daniel P. Berrange <berrange redhat com>

 Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 64d8ecf..69d1f50 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -69,7 +69,7 @@ dist-hook: gen-ChangeLog gen-AUTHORS
 
 .PHONY: gen-ChangeLog
 gen-ChangeLog:
-       $(AM_V_GEN)if test -d .git; then                \
+       $(AM_V_GEN)if test -d $(srcdir)/.git; then      \
          $(top_srcdir)/build-aux/gitlog-to-changelog   \
            --since=$(gen_start_date) > $(distdir)/cl-t;\
          rm -f $(distdir)/ChangeLog;                   \