libwebsockets: add 4.2.0

pkgs/development/libraries/libwebsockets/default.nix

@@ -20,6 +20,8 @@ let
       "-DLWS_WITH_PLUGINS=ON"
       "-DLWS_WITH_IPV6=ON"
       "-DLWS_WITH_SOCKS5=ON"
+      # Required since v4.2.0
+      "-DLWS_BUILD_HASH=no_hash"
     ] ++ lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) "-DLWS_WITHOUT_TESTAPPS=ON";
 
     NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isGNU "-Wno-error=unused-but-set-variable";
@@ -61,4 +63,9 @@ rec {
     version = "4.1.6";
     sha256 = "0x56v4hsx92vm1zibfmnqb5g3v23kzciffn3fjlsc3sly2pknhsg";
   };
+
+  libwebsockets_4_2 = generic {
+    version = "4.2.0";
+    sha256 = "glnLGXniero/5CW/1TBPZngdOM6gww8DnT5wiX66sW0=";
+  };
 }

pkgs/top-level/all-packages.nix

@@ -6502,7 +6502,8 @@ in
     libwebsockets_3_1
     libwebsockets_3_2
     libwebsockets_4_0
-    libwebsockets_4_1;
+    libwebsockets_4_1
+    libwebsockets_4_2;
   libwebsockets = libwebsockets_3_2;
 
   licensee = callPackage ../tools/package-management/licensee { };