Revert "configure.ac: Bump version to 8.3"

This reverts commit 5dce2160 as it
didn't build.

configure.ac

@@ -13,7 +13,7 @@ dnl
 # see what flags are available. (Better yet, read the documentation!)
 #
 
-AC_INIT([The Glorious Glasgow Haskell Compilation System], [8.3], [glasgow-haskell-bugs@haskell.org], [ghc-AC_PACKAGE_VERSION])
+AC_INIT([The Glorious Glasgow Haskell Compilation System], [8.1], [glasgow-haskell-bugs@haskell.org], [ghc-AC_PACKAGE_VERSION])
 
 # Set this to YES for a released version, otherwise NO
 : ${RELEASE=NO}

iserv/iserv-bin.cabal

@@ -24,7 +24,7 @@ Executable iserv
                    bytestring >= 0.10 && < 0.11,
                    containers >= 0.5 && < 0.6,
                    deepseq    >= 1.4 && < 1.5,
-                   ghci       == 8.3
+                   ghci       == 8.1
 
     if os(windows)
         Cpp-Options: -DWINDOWS