[empathy] tp-aw: build: Don't hard code the name of the pkg-config binary

[Laurent Bigonville <lbigon src gnome org>]

commit 5801158770b52f6b87cadd400ec4e719b4c5bd18
Author: Laurent Bigonville <bigon bigon be>
Date:   Fri Apr 22 09:18:06 2016 +0200

    tp-aw: build: Don't hard code the name of the pkg-config binary

 telepathy-account-widgets |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/telepathy-account-widgets b/telepathy-account-widgets
index 2c9df05..f2d99ae 160000
--- a/telepathy-account-widgets
+++ b/telepathy-account-widgets
@@ -1 +1 @@
-Subproject commit 2c9df052d8993590f9d2cc2bf596a07241a59ad4
+Subproject commit f2d99ae83eab8a0aacd9d9d191a219c9af6536fb