gf.cabal: version 3.1.91, remove pgf-http

The version of cabal distributed with Ubuntu 10.10 is too old to handle
executables that refer to the library in the same package, so to not make it
too complicated for Ubuntu users to compile GF from source, pgf-http is no
longer part of the main gf.cabal. :-(

gf.cabal

@@ -1,5 +1,5 @@
 name: gf
-version: 3.1.90
+version: 3.1.91
 
 cabal-version: >= 1.8
 build-type: Custom
@@ -163,31 +163,3 @@ executable gf
     other-modules: GF.System.UseSignal
   else
     other-modules: GF.System.NoSignal
-
-
-executable pgf-http
-  hs-source-dirs: src/server
-  main-is: pgf-http.hs
-  other-modules: PGFService FastCGIUtils Cache URLEncoding
-                 RunHTTP ServeStaticFile
-  ghc-options: -threaded
-
-  build-depends: base >=4.2 && <5,
-                 old-time,
-                 directory,
-                 filepath,
-                 containers,
-                 process,
-                 gf,
-                 cgi >= 3001.1.8.0,
-                 httpd-shed,
-                 network,
-                 json >= 0.3.3,
-                 utf8-string >= 0.3.1.1,
-                 bytestring,
-                 pretty,
-                 random
-  if os(windows)
-    ghc-options: -optl-mwindows
-  else
-    build-depends: unix