Haskell-CI: do not insist on installed Cabal-syntax

Author: andreasabel

.github/workflows/haskell-ci.yml

@@ -177,7 +177,7 @@ jobs:
           echo "    ghc-options: -Werror=missing-methods" >> cabal.project
           cat >> cabal.project <<EOF
           EOF
-          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: $_ installed\n" unless /^(Cabal|hackage-server|parsec|process|text)$/; }' >> cabal.project.local
+          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: $_ installed\n" unless /^(Cabal|Cabal-syntax|hackage-server|parsec|process|text)$/; }' >> cabal.project.local
           cat cabal.project
           cat cabal.project.local
       - name: dump install plan

cabal.haskell-ci

@@ -1,6 +1,6 @@
 branches: master ci*
 
-installed: +all -Cabal -text -parsec -process
+installed: +all -Cabal -Cabal-syntax -text -parsec -process
 
 -- Does not work with GHA:
 -- -- allow failures with ghc-7.6 and ghc-7.8