md4c: migrate to by-name

pkgs/by-name/md/md4c/package.nix

@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
     # We set CMAKE_INSTALL_LIBDIR to the absolute path in $out, so
     # prefix and exec_prefix cannot be $out, too
     # Use CMake's _FULL_ variables instead of `prefix` concatenation.
-    ./fix-pkgconfig.patch
+    ./0001-fix-pkgconfig.patch
   ];
 
   nativeBuildInputs = [

pkgs/top-level/all-packages.nix

@@ -23872,8 +23872,6 @@ with pkgs;
 
   mdctags = callPackage ../development/tools/misc/mdctags { };
 
-  md4c = callPackage ../development/libraries/md4c { };
-
   mdds = callPackage ../development/libraries/mdds { };
 
   mediastreamer = libsForQt5.callPackage ../development/libraries/mediastreamer { };