media-gfx/pngnq: update EAPI 7 -> 8

Signed-off-by: David Seifert <soap@gentoo.org>

media-gfx/pngnq/files/pngnq-1.0-Wimplicit-function-declaration.patch

@@ -0,0 +1,10 @@
+--- a/src/rwpng.c
++++ b/src/rwpng.c
+@@ -31,6 +31,7 @@
+ 
+ #include <stdio.h>
+ #include <stdlib.h>
++#include <string.h>
+ #include <zlib.h>
+ 
+ #include "png.h"        /* libpng header */

media-gfx/pngnq/pngnq-1.1-r1.ebuild

@@ -0,0 +1,29 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit autotools
+
+DESCRIPTION="Pngnq is a tool for quantizing PNG images in RGBA format"
+HOMEPAGE="http://pngnq.sourceforge.net/"
+SRC_URI="mirror://sourceforge/${PN}/${P}.tar.gz"
+
+LICENSE="BSD pngnq rwpng"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+
+RDEPEND="media-libs/libpng:0="
+DEPEND="${RDEPEND}"
+BDEPEND="virtual/pkgconfig"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-1.0-libpng14.patch
+	"${FILESDIR}"/${PN}-1.0-libpng15.patch
+	"${FILESDIR}"/${PN}-1.0-Wimplicit-function-declaration.patch
+)
+
+src_prepare() {
+	default
+	eautoreconf
+}