[OE-core] [PATCH] gtk-doc: Add pkgconfig inherit

[Richard Purdie]

Anything using gtk-doc will be using pkgconfig as well so
add in the dependency rather than doing it for each and every recipe.

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>

diff --git a/meta/classes/gtk-doc.bbclass b/meta/classes/gtk-doc.bbclass
index fb7863e..e32f98d 100644
--- a/meta/classes/gtk-doc.bbclass
+++ b/meta/classes/gtk-doc.bbclass
@@ -21,3 +21,5 @@ EXTRA_OECONF_append = "\
 do_configure_prepend () {
 	( cd ${S}; gtkdocize --docdir ${GTKDOC_DOCDIR} )
 }
+
+inherit pkgconfig