[pitivi] build: fix make install

[Jean-François Fortin Tam <jfft src gnome org>]

commit 7d884346095c68a15fbc3a65c8dcf359dbf675df
Author: Dominique Leuenberger <dimstar opensuse org>
Date:   Fri Oct 10 22:23:41 2014 +0200

    build: fix make install
    
    Since commit 0de1e04, signal.py no longer exists. So let's also not
    attempt to install it in the end.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=738324

 pitivi/utils/Makefile.am |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/utils/Makefile.am b/pitivi/utils/Makefile.am
index 715ba67..f7b9a31 100644
--- a/pitivi/utils/Makefile.am
+++ b/pitivi/utils/Makefile.am
@@ -6,7 +6,6 @@ utils_PYTHON =  \
        timeline.py     \
        loggable.py     \
        pipeline.py     \
-       signal.py       \
        ui.py           \
        system.py       \
        threads.py      \