stack: disable ofd-locking in lukko.

https://github.com/haskellari/lukko/issues/15
https://github.com/commercialhaskell/stack/issues/5589

srcpkgs/stack/template

@@ -1,7 +1,7 @@
 # Template file for 'stack'
 pkgname=stack
 version=2.7.1
-revision=1
+revision=2
 _stackage="lts-17.5"
 hostmakedepends="cabal-install pkg-config unzip"
 makedepends="zlib-devel pcre-devel"
@@ -21,7 +21,8 @@ nopie_files="/usr/bin/stack"
 do_build() {
 	cp ${XBPS_SRCDISTDIR}/${pkgname}-${version}/cabal.config-${_stackage} cabal.config
 	HOME=$PWD cabal update
-	HOME=$PWD cabal new-build ${makejobs} --flag disable-git-info
+	HOME=$PWD cabal new-build ${makejobs} --flag disable-git-info \
+		--constraint 'lukko -ofd-locking'  # https://github.com/haskell/cabal/issues/7313
 }
 
 do_install() {