remove gmcs substitutes from mono packages

pkgs/applications/misc/pdfmod/default.nix

@@ -24,7 +24,6 @@ stdenv.mkDerivation rec {
   ];
 
   preConfigure = ''
-    substituteInPlace configure --replace gmcs mcs
     substituteInPlace lib/poppler-sharp/poppler-sharp/poppler-sharp.dll.config \
       --replace libpoppler-glib.so.4 libpoppler-glib.so
   '';

pkgs/development/libraries/hyena/default.nix

@@ -19,10 +19,6 @@ stdenv.mkDerivation rec {
     find -name Makefile.in | xargs -n 1 -d '\n' sed -e 's/^dnl/#/' -i
   '';
 
-  preConfigure = ''
-    substituteInPlace configure --replace gmcs mcs
-  '';
-
   dontStrip = true;
 
   inherit monoDLLFixer;

pkgs/top-level/dotnet-packages.nix

@@ -532,10 +532,6 @@ let self = dotnetPackages // overrides; dotnetPackages = with self; {
       pkgconfig
     ];
 
-    preConfigure = ''
-      substituteInPlace configure --replace gmcs mcs
-    '';
-
     postInstall = ''
       # Otherwise pkg-config won't find it and the DLL will get duplicated
       ln -sv $out/lib/pkgconfig/ndesk-options.pc $out/lib/pkgconfig/NDesk.Options.pc