user/gtk-doc: unmaintained bump to 1.3.1 (Adopt me today)

user/gtk-doc/APKBUILD

 # Maintainer: 
 pkgname=gtk-doc
-pkgver=1.30
+pkgver=1.31
 pkgrel=0
 pkgdesc="Documentation tool for public library API"
 url="https://www.gtk.org/gtk-doc/"
@@ -14,11 +14,6 @@ makedepends="rarian-dev py-libxml2 itstool autoconf automake libtool"
 checkdepends="bc"
 source="https://download.gnome.org/sources/$pkgname/$pkgver/$pkgname-$pkgver.tar.xz"
 
-prepare() {
-	autoreconf -vif
-	default_prepare
-}
-
 build() {
 	export PYTHON="/usr/bin/python3"
 	./configure \
@@ -37,4 +32,4 @@ package() {
 	make DESTDIR="$pkgdir" install
 }
 
-sha512sums="8fde6aa89cdf0ce59999a17d7f1ecb51e63f93aa7514aeffac6504a357408151f8fb86431050285596e9da2a9612840969a42d7423e8df316e9dadddd5fc1612  gtk-doc-1.30.tar.xz"
+sha512sums="5f1bd314cafa5dee53fe3358b66b1f730536306cdec4294327410e86353040a05716e33990af03e221e83f917fab0224eeb22f13ec6cf901e81466eb7c720e86  gtk-doc-1.31.tar.xz"