Revert "Add info about git commit and date to --version info."

This reverts commit 9d7c01e4a4.

pandoc.cabal

@@ -528,8 +528,7 @@ library
                  xml-types             >= 0.3      && < 0.4,
                  yaml                  >= 0.11     && < 0.12,
                  zip-archive           >= 0.2.3.4  && < 0.5,
-                 zlib                  >= 0.5      && < 0.7,
-                 githash               >= 0.1.6.2  && < 0.2
+                 zlib                  >= 0.5      && < 0.7
   if !os(windows)
     build-depends:  unix >= 2.4 && < 2.8
   if flag(lua53)

src/Text/Pandoc/App/CommandLineOptions.hs

@@ -5,7 +5,6 @@
 {-# LANGUAGE OverloadedStrings   #-}
 {-# LANGUAGE FlexibleContexts    #-}
 {-# LANGUAGE TypeApplications    #-}
-{-# LANGUAGE TemplateHaskell     #-}
 {- |
    Module      : Text.Pandoc.App.CommandLineOptions
    Copyright   : Copyright (C) 2006-2022 John MacFarlane
@@ -71,7 +70,6 @@ import qualified Data.ByteString.Lazy as B
 import qualified Data.Map as M
 import qualified Data.Text as T
 import qualified Text.Pandoc.UTF8 as UTF8
-import GitHash
 
 parseOptions :: [OptDescr (Opt -> IO Opt)] -> Opt -> IO Opt
 parseOptions options' defaults = do
@@ -954,14 +952,9 @@ options =
                        openlibs
                        getglobal "_VERSION"
                        peek top
-                     let buildInfo = either
-                             (\_ -> mempty)
-                             (\gi -> "\nBuilt from commit " ++ giDescribe gi ++
-                                     " on " ++ giCommitDate gi)
-                             $$tGitInfoCwdTry
                      UTF8.hPutStrLn stdout
                       $ T.pack
-                      $ prg ++ " " ++ T.unpack pandocVersion ++ buildInfo ++
+                      $ prg ++ " " ++ T.unpack pandocVersion ++
                         compileInfo ++ "\nScripting engine: " ++ luaVersion ++
                         "\nUser data directory: " ++ defaultDatadir ++
                         ('\n':copyrightMessage)