Added a list of the modules in the package that don't work with Hugs.
Such modules are skipped by the conversion script. Packages in which
everything works with Hugs don't need such a file.
--- /dev/null
+# List of the modules in this package that aren't to be used with Hugs.
+# Only the first word on each line counts; the rest can be explanation.
+#
+Control.Parallel.Strategies unused by GHC too
+Data.Array.Diff
+Data.Array.Unboxed GHC-specific implementation
+Data.Generics GHC-specific
+Data.PackedString uses Data.Array.Unboxed
+Debug.QuickCheck.Batch needs pre-emptive concurrency
+System.Info
+System.Posix.Signals
+Text.ParserCombinators.ReadP ReadS clashes with Prelude
+Text.ParserCombinators.ReadPrec uses ReadP
+Text.Read.Lex uses ReadP