Cabal revisions of lhs2tex-1.21

Hackage metadata revisions edit the .cabal file after upload; each diff below is one revision.

 cabal-version:  >=1.10 name:           lhs2tex version:        1.21+x-revision: 1 license:        GPL license-file:   LICENSE author:         Ralf Hinze <ralf.hinze@comlab.ox.ac.uk>, Andres Loeh <lhs2tex@andres-loeh.de>                         TypeSynonymInstances   build-depends:        base >= 4.2 && < 5,                         regex-compat,-                        mtl >= 2.2.1,+                        mtl >= 2.2.1 && < 2.3,                         filepath,                         directory,                         process