chkservice: pull fix for gcc-11

Without the change build fails on gcc-11 as:

    src/chk-systemd.cpp: In member function 'const char* ChkBus::getState(const char*)':
    src/chk-systemd.cpp:120:15: error: ordered comparison of pointer with integer zero ('const char*' and 'int')
      120 |     if (state < 0) {
          |         ~~~~~~^~~

pkgs/tools/admin/chkservice/default.nix

@@ -1,4 +1,13 @@
-{ stdenv, fetchFromGitHub, cmake, ninja, pkg-config, systemd, ncurses, lib }:
+{ lib
+, stdenv
+, fetchFromGitHub
+, fetchpatch
+, cmake
+, ninja
+, pkg-config
+, systemd
+, ncurses
+}:
 
 stdenv.mkDerivation rec {
   pname = "chkservice";
@@ -8,9 +17,19 @@ stdenv.mkDerivation rec {
     owner = "linuxenko";
     repo = "chkservice";
     rev = version;
-    hash = "sha256:0dfvm62h6dwg18f17fn58nr09mfh6kylm8wy88j00fiy13l4wnb6";
+    hash = "sha256-ZllO6Ag+OgAkQp6jSv000NUEskXFuhMcCo83A4Wp2zU=";
   };
 
+  patches = [
+    # Pull fix pending upstream inclusion for gcc-11 support:
+    #   https://github.com/linuxenko/chkservice/pull/38
+    (fetchpatch {
+      name = "gcc-11.patch";
+      url = "https://github.com/linuxenko/chkservice/commit/26b12a7918c8a3bc449c92b458e6cd5c2d7b2e05.patch";
+      hash = "sha256-LaJLlqRyn1eoahbW2X+hDSt8iV4lhNRn0j0kLHB+RhM=";
+    })
+  ];
+
   # Tools needed during build time
   nativeBuildInputs = [
     cmake

pkgs/top-level/all-packages.nix

@@ -208,9 +208,7 @@ with pkgs;
       }
     '');
 
-  chkservice = callPackage ../tools/admin/chkservice {
-    stdenv = gcc10StdenvCompat;
-  };
+  chkservice = callPackage ../tools/admin/chkservice { };
 
   addOpenGLRunpath = callPackage ../build-support/add-opengl-runpath { };