[pitivi] Revert "coptimisations: Properly link against python3"

[Thibault Saunier <tsaunier src gnome org>]

commit c701446dcb759805b78ccfd0100e934c30f0da02
Author: Thibault Saunier <tsaunier gnome org>
Date:   Wed Sep 23 12:35:31 2015 +0200

    Revert "coptimisations: Properly link against python3"
    
    This reverts commit c6f84b192b2a79012361cd33ea5dd395db19ff3d.
    
    After some conversation in
    https://bugzilla.gnome.org/show_bug.cgi?id=755434 it was decided that
    it was a bad idea :)

 configure.ac                      |    1 -
 pitivi/coptimizations/Makefile.am |    6 ++++--
 2 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 6d5bccc..c2f719f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -107,7 +107,6 @@ AS_IF([test "x$HAVE_GSTREAMER" = xno],
 
 PKG_CHECK_MODULES([cairo], [cairo])
 PKG_CHECK_MODULES([py3cairo], [py3cairo])
-PKG_CHECK_MODULES([python3], [python3])
 
 AC_ARG_ENABLE(help,
   AS_HELP_STRING([--disable-help],[disable help]),
diff --git a/pitivi/coptimizations/Makefile.am b/pitivi/coptimizations/Makefile.am
index 494f29b..e11a801 100644
--- a/pitivi/coptimizations/Makefile.am
+++ b/pitivi/coptimizations/Makefile.am
@@ -2,5 +2,7 @@ pyexec_LTLIBRARIES = renderer.la
 
 renderer_la_SOURCES = renderer.c
 pyexecdir = $(libdir)/pitivi/python/pitivi/timeline/
-renderer_la_CFLAGS = $(cairo_CFLAGS) $(py3cairo_CFLAGS) $(python3_CFLAGS)
-renderer_la_LDFLAGS = -module -avoid-version $(LIBS) $(cairo_LIBS) $(py3cairo_LIBS) $(python3_LIBS)
+AM_CFLAGS = $(cairo_CFLAGS) $(py3cairo_CFLAGS)
+LIBS = $(cairo_LIBS) $(py3cairo_LIBS)
+renderer_la_CFLAGS = $(PYTHON_CFLAGS) $(AM_CFLAGS)
+renderer_la_LDFLAGS = -module -avoid-version $(LIBS)