user/stow: bump to 2.3.1, update license accordingly

user/stow/APKBUILD

 # Contributor: Stefan Wagner <stw@bit-strickerei.de>
 # Maintainer: Max Rees <maxcrees@me.com>
 pkgname=stow
-pkgver=2.2.2
+pkgver=2.3.1
 pkgrel=0
 pkgdesc="Manage installation of multiple softwares in the same directory tree"
 url="https://www.gnu.org/software/stow/"
 arch="noarch"
-license="GPL-2.0-only"
+license="GPL-3.0+"
 depends="perl"
 makedepends="perl-test-output"
 checkdepends="perl-io-stringy"
@@ -14,7 +14,6 @@ subpackages="$pkgname-doc"
 source="https://ftp.gnu.org/pub/gnu/$pkgname/$pkgname-$pkgver.tar.gz"
 
 build() {
-	cd "$builddir"
 	./configure \
 		--prefix=/usr \
 		--mandir=/usr/share/man \
@@ -23,15 +22,13 @@ build() {
 }
 
 check() {
-	cd "$builddir"
 	make check
 }
 
 package() {
-	cd "$builddir"
 	make DESTDIR="$pkgdir" install
 	rm "$pkgdir"/usr/share/doc/stow/manual.pdf
 	rm "$pkgdir"/usr/share/doc/stow/version.texi
 }
 
-sha512sums="8a3e5da6b5cb4c1ee1b512bae5a9859f83659d5de05f7a9af1dd09df2a32f6b8c6d43b79736db91232c43621d542041d4ef92eb088925796adad0676f200a9b5  stow-2.2.2.tar.gz"
+sha512sums="e9a7de1a6f10eaf7cdbe6737e0a8be1498e2eac46b6c57e65b83759b061efd1c0db45f7cba123e35428307e3aebe5baef9ea8bd4b5eb6ec5e1b159117a760441  stow-2.3.1.tar.gz"