tree-wide: disable doCheck and doInstallCheck where it fails (the trivial part)

pkgs/development/libraries/tk/8.5.nix

@@ -8,4 +8,3 @@ callPackage ./generic.nix (args // rec {
   };
 
 })
-

pkgs/development/libraries/tk/8.6.nix

@@ -10,4 +10,3 @@ callPackage ./generic.nix (args // rec {
   patches = [ ./different-prefix-with-tcl.patch ] ++ stdenv.lib.optionals stdenv.isDarwin [ ./Fix-bad-install_name-for-libtk8.6.dylib.patch ];
 
 })
-

pkgs/development/libraries/tk/generic.nix

@@ -31,6 +31,8 @@ stdenv.mkDerivation {
 
   NIX_CFLAGS_LINK = if stdenv.isDarwin then "-lfontconfig" else null;
 
+  doCheck = false; # fails. can't find itself
+
   inherit tcl;
 
   passthru = rec {