Add cabal-rpm back juhp/cabal-rpm#18

build-constraints.yaml

@@ -748,9 +748,7 @@ packages:
         - HaskellNet
 
     "Jens Petersen juhpetersen@gmail.com @juhp":
-        []
-        # https://github.com/juhp/cabal-rpm/issues/18
-        # - cabal-rpm # GHC 7.10
+        - cabal-rpm
 
     "Renzo Carbonara renzocarbonara@gmail.com @k0001":
         - network-simple
@@ -1015,6 +1013,9 @@ package-flags:
     HsOpenSSL:
         fast-bignum: false
 
+    cabal-rpm:
+        old-locale: false
+
 # By skipping a test suite, we do not pull in the build dependencies
 skipped-tests:
     - ReadArgs # old version of hspec