community/units: split units_cur bin

only used to update the currency database, and needs python3 to do so

community/units/APKBUILD

@@ -2,18 +2,17 @@
 # Maintainer: Miguel Terron <miguel.a.terron@gmail.com>
 pkgname=units
 pkgver=2.21
-pkgrel=1
+pkgrel=2
 pkgdesc="Units conversion and calculation program"
 url="https://www.gnu.org/software/units/"
 arch="all"
 license="GPL-3.0-only"
 makedepends="readline-dev python3 py3-requests"
-subpackages="$pkgname-doc"
+subpackages="$pkgname-doc $pkgname-cur-update:_cur"
 source="https://ftp.gnu.org/gnu/units/units-$pkgver.tar.gz"
 
 build() {
-	export PYTHON=$(which python3)
-	sed -i "1c #!$PYTHON" units_cur
+	export PYTHON="$(command -v python3)"
 	./configure \
 		--build=$CBUILD \
 		--host=$CHOST \
@@ -32,6 +31,13 @@ package() {
 	make DESTDIR="$pkgdir" install
 }
 
+_cur() {
+	pkgdesc="$pkgdesc (currency database updater)"
+	depends="units py3-requests python3"
+
+	amove usr/bin/units_cur
+}
+
 sha512sums="
 34bacff606f12aa5b2e59170f6b2142277aa1121d79610a51b57f07f17ae2dbdfbbb0e60be34522f367679cc152408f77c1ebb551016224d23f81c21f4b3ba62  units-2.21.tar.gz
 "