[pitivi] Minor meson cleanup

[Thibault Saunier <tsaunier src gnome org>]

commit a0567af667e90e867d0a588c660c901dbca7edd1
Author: Thibault Saunier <tsaunier gnome org>
Date:   Fri Jul 29 10:31:07 2016 -0400

    Minor meson cleanup

 meson.build                     |    8 ++++----
 subprojects/gst-transcoder.wrap |    4 ----
 2 files changed, 4 insertions(+), 8 deletions(-)
---
diff --git a/meson.build b/meson.build
index bc5d3b4..289f8db 100644
--- a/meson.build
+++ b/meson.build
@@ -1,9 +1,9 @@
 project('pitivi', 'c', version: '0.96.0.1')
 
-python = find_program('python3', required : true)
-intltool_merge = find_program('intltool-merge', required : true)
-itstool = find_program('itstool', required : true)
-msgfmt = find_program('msgfmt', required : true)
+python = find_program('python3')
+intltool_merge = find_program('intltool-merge')
+itstool = find_program('itstool')
+msgfmt = find_program('msgfmt')
 
 python_dep = dependency('python3', version : '>= 3.3')
 gst_dep = dependency('gstreamer-1.0', version : '>= 1.8.2')