Fix T4437

This test tests if the flags are in sync between GHC and
Cabal.
After b0b80e90 'Implement the basics of hex floating point
literals' landed, the Cabal side had to be updated. That
has been done, and 835d8ddb 'GHC.Prim use virtual-modules'
brought the Cabal submodule up to date.

testsuite/tests/driver/T4437.hs

@@ -39,8 +39,7 @@ expectedGhcOnlyExtensions :: [String]
 expectedGhcOnlyExtensions = ["RelaxedLayout",
                              "AlternativeLayoutRule",
                              "AlternativeLayoutRuleTransitional",
-                             "EmptyDataDeriving",
-                             "HexFloatLiterals"]
+                             "EmptyDataDeriving"]
 
 expectedCabalOnlyExtensions :: [String]
 expectedCabalOnlyExtensions = ["Generics",