community/libexttextcat: upgrade to 3.4.6, modernize

community/libexttextcat/APKBUILD

 # Contributor: Timo Teräs <timo.teras@iki.fi>
 # Maintainer: Timo Teräs <timo.teras@iki.fi>
 pkgname=libexttextcat
-pkgver=3.4.5
-pkgrel=1
+pkgver=3.4.6
+pkgrel=0
 pkgdesc="An N-Gram-Based Text Categorization library"
 url="https://wiki.documentfoundation.org/Libexttextcat"
 arch="all"
 license="MPL-2.0"
 checkdepends="bash"
 subpackages="$pkgname-dev"
-source="https://dev-www.libreoffice.org/src/$pkgname/$pkgname-$pkgver.tar.xz"
-builddir="$srcdir"/$pkgname-$pkgver
-
-prepare() {
-	default_prepare
-	update_config_sub
-	update_config_guess
-}
+source="https://dev-www.libreoffice.org/src/libexttextcat/libexttextcat-$pkgver.tar.xz"
 
 build() {
-	cd "$builddir"
 	./configure \
 		--build=$CBUILD \
 		--host=$CHOST \
@@ -32,13 +24,13 @@ build() {
 }
 
 check() {
-	cd "$builddir"
 	make check
 }
 
 package() {
-	cd "$builddir"
 	make DESTDIR="$pkgdir" install
 }
 
-sha512sums="f05a9f08c2f2f335d0e483c024321b96fee7424bc1398d4c6acbd9c501f92e22f881bc3d6ec2c0434f9bf4604f3c4b0e880e37d3d0de410eac1a20ea6669baa6  libexttextcat-3.4.5.tar.xz"
+sha512sums="
+5fe7b9b78d2d81b26ba07ce16c6dae490369a0a8b11561cc1260d893c86ef54cf76982751927eed71ac792cdbb47bac0f7acc71939a38c93310ee2bda174448b  libexttextcat-3.4.6.tar.xz
+"