Revert "treewide: apply hack to packages that fail after GCC symlink changes"

This reverts commit aca1e446e2.

pkgs/by-name/bo/bonmin/package.nix

@@ -57,12 +57,6 @@ stdenv.mkDerivation rec {
     "--with-asl-lib=-lipoptamplinterface -lamplsolver"
   ];
 
-  # FIXME: ugly hack for https://github.com/NixOS/nixpkgs/pull/389009
-  postConfigure = ''
-    substituteInPlace libtool \
-      --replace 'for search_ext in .la $std_shrext .so .a' 'for search_ext in $std_shrext .so .a'
-  '';
-
   # Fix doc install. Should not be necessary after next release
   # ref https://github.com/coin-or/Bonmin/commit/4f665bc9e489a73cb867472be9aea518976ecd28
   sourceRoot = "${src.name}/Bonmin";

pkgs/by-name/ec/eclib/package.nix

@@ -41,13 +41,6 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [
     autoreconfHook
   ];
-
-  # FIXME: ugly hack for https://github.com/NixOS/nixpkgs/pull/389009
-  postConfigure = ''
-    substituteInPlace libtool \
-      --replace 'for search_ext in .la $std_shrext .so .a' 'for search_ext in $std_shrext .so .a'
-  '';
-
   doCheck = true;
   meta = with lib; {
     description = "Elliptic curve tools";

pkgs/by-name/gi/giac/package.nix

@@ -106,12 +106,6 @@ stdenv.mkDerivation rec {
     substituteInPlace src/global.cc --replace 'browser="mozilla"' 'browser="xdg-open"'
   '';
 
-  # FIXME: ugly hack for https://github.com/NixOS/nixpkgs/pull/389009
-  postConfigure = ''
-    substituteInPlace libtool \
-      --replace 'for search_ext in .la $std_shrext .so .a' 'for search_ext in $std_shrext .so .a'
-  '';
-
   nativeBuildInputs = [
     autoreconfHook
     texliveSmall

pkgs/desktops/mate/caja/default.nix

@@ -46,12 +46,6 @@ stdenv.mkDerivation rec {
 
   configureFlags = [ "--disable-update-mimedb" ];
 
-  # FIXME: ugly hack for https://github.com/NixOS/nixpkgs/pull/389009
-  postConfigure = ''
-    substituteInPlace libtool \
-      --replace 'for search_ext in .la $std_shrext .so .a' 'for search_ext in $std_shrext .so .a'
-  '';
-
   enableParallelBuilding = true;
 
   passthru.updateScript = mateUpdateScript { inherit pname; };

pkgs/development/libraries/gtk-sharp/3.0.nix

@@ -22,12 +22,6 @@ stdenv.mkDerivation rec {
     sha256 = "18n3l9zcldyvn4lwi8izd62307mkhz873039nl6awrv285qzah34";
   };
 
-  # FIXME: ugly hack for https://github.com/NixOS/nixpkgs/pull/389009
-  postConfigure = ''
-    substituteInPlace libtool \
-      --replace 'for search_ext in .la $std_shrext .so .a' 'for search_ext in $std_shrext .so .a'
-  '';
-
   nativeBuildInputs = [ pkg-config ];
   buildInputs = [
     mono