Revert "Add cabal constraint: process < 1.3"

This reverts commit f0d23a001d, which was
a workaround for overly strict constraint in optparse-applicative that
was fixed with pcapriotti/optparse-applicative@22a71d8.

compiler/bond.cabal

@@ -42,7 +42,6 @@ library
                     ghc-prim,
                     mtl >= 2.1,
                     parsec >= 3.1,
-                    process < 1.3,
                     shakespeare >= 2.0,
                     text >= 0.11
   ghc-options:      -Wall