dev-util/gtk-doc: mkpdf: fix exitcode (bug 646850)

Fix gtk-doc exitcode. The problem can be demonstrated by building
gtk-doc with dblatex installed, and then building evince with
EXTRA_ECONF="--enable-gtk-doc --enable-gtk-doc-pdf".

Bug: https://bugs.gentoo.org/646850
See: 1baf9a63bd
Package-Manager: Portage-2.3.48, Repoman-2.3.10

dev-util/gtk-doc/gtk-doc-1.25-r1.ebuild

@@ -50,6 +50,10 @@ src_prepare() {
 	# Remove global Emacs keybindings, bug #184588
 	eapply "${FILESDIR}"/${PN}-1.8-emacs-keybindings.patch
 
+	# Apply upstream commit 1baf9a6, bug #646850
+	sed -e '1,/exit 1/s/exit 1/exit $1/' \
+		-i gtkdoc-mkpdf.in || die
+
 	gnome2_src_prepare
 }