gtk-doc: gtk-doc: hack around wrapper leaking into config

See #7977

srcpkgs/gtk-doc/patches/pkg-config-hack.patch

@@ -0,0 +1,11 @@
+--- gtkdoc/config.py.in.orig	2017-04-16 13:04:44.000000000 +0000
++++ gtkdoc/config.py.in	2017-10-08 19:32:23.350518442 +0000
+@@ -5,7 +5,7 @@
+ fop = '@FOP@'
+ highlight = '@HIGHLIGHT@'
+ highlight_options = '@HIGHLIGHT_OPTIONS@'
+-pkg_config = '@PKG_CONFIG@'
++pkg_config = 'pkg-config'
+ xsltproc = '@XSLTPROC@'
+ 
+ # configured directories

srcpkgs/gtk-doc/template

@@ -1,7 +1,7 @@
 # Template file for 'gtk-doc'
 pkgname=gtk-doc
 version=1.26
-revision=1
+revision=2
 noarch="yes"
 build_style=gnu-configure
 hostmakedepends="pkg-config itstool python docbook-xsl gnome-doc-utils perl"