main/util-linux: fix cross building

main/util-linux/APKBUILD

@@ -30,6 +30,8 @@ subpackages="$pkgname-doc $pkgname-dev $pkgname-bash-completion:bashcomp
 if [ -z "$BOOTSTRAP" ]; then
 	makedepends_host="$makedepends_host ncurses-dev python-dev"
 	subpackages="$subpackages py-libmount:_py"
+else
+	_bootstrap_config="--without-python"
 fi
 makedepends="$makedepends_build $makedepends_host"
 replaces="e2fsprogs util-linux-ng"
@@ -55,6 +57,7 @@ build() {
 	./configure \
 		--build=$CBUILD \
 		--host=$CHOST \
+		--with-sysroot=$CBUILDROOT \
 		--prefix=/usr \
 		--enable-raw \
 		--with-ncurses \
@@ -66,6 +69,7 @@ build() {
 		--disable-last \
 		--disable-sulogin \
 		--disable-su \
+		$_bootstrap_config \
 		|| return 1
 	make || return 1
 }