grobi: fix failing test on go 1.15

pkgs/tools/X11/grobi/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, buildGoModule }:
+{ stdenv, fetchFromGitHub, buildGoModule, fetchpatch }:
 
 buildGoModule rec {
   version = "0.6.0";
@@ -13,6 +13,14 @@ buildGoModule rec {
 
   vendorSha256 = "1ibwx5rbxkygfx78j3g364dmbwwa5b34qmzq3sqcbrsnv8rzrwvj";
 
+  patches = [
+    # fix failing test on go 1.15
+    (fetchpatch {
+      url = "https://github.com/fd0/grobi/commit/176988ab087ff92d1408fbc454c77263457f3d7e.patch";
+      sha256 = "0j8y3gns4lm0qxqxzmdn2ll0kq34mmfhf83lvsq13iqhp5bx3y31";
+    })
+  ];
+
   meta = with stdenv.lib; {
     homepage = "https://github.com/fd0/grobi";
     description = "Automatically configure monitors/outputs for Xorg via RANDR";

pkgs/top-level/all-packages.nix

@@ -2236,9 +2236,7 @@ in
 
   gringo = callPackage ../tools/misc/gringo { };
 
-  grobi = callPackage ../tools/X11/grobi {
-    buildGoModule = buildGo114Module;
-  };
+  grobi = callPackage ../tools/X11/grobi { };
 
   gscan2pdf = callPackage ../applications/graphics/gscan2pdf { };