Prevent Pango to build tests.

Updated to Pango 1.36.3 by Hadrien Boutteville.

Signed-off-by: Hadrien Boutteville <hadrien.boutteville@gmail.com>
[Gustavo: update for 1.38.1]

diff -Nura pango-1.38.1.orig/Makefile.am pango-1.38.1/Makefile.am
--- pango-1.38.1.orig/Makefile.am	2015-10-14 15:41:27.620016974 +0000
+++ pango-1.38.1/Makefile.am	2015-10-14 15:41:54.431240793 +0000
@@ -1,6 +1,6 @@
 ## Process this file with automake to create Makefile.in.
 
-SUBDIRS= pango pango-view examples docs tools tests build
+SUBDIRS= pango pango-view examples docs tools build
 
 EXTRA_DIST = 			\
 	autogen.sh		\
diff -Nura pango-1.38.1.orig/Makefile.in pango-1.38.1/Makefile.in
--- pango-1.38.1.orig/Makefile.in	2015-10-14 15:41:27.630016685 +0000
+++ pango-1.38.1/Makefile.in	2015-10-14 15:41:58.753115676 +0000
@@ -417,7 +417,7 @@
 top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
-SUBDIRS = pango pango-view examples docs tools tests build
+SUBDIRS = pango pango-view examples docs tools build
 EXTRA_DIST = \
 	autogen.sh		\
 	pango.pc.in		\