grc: add support for absolute store paths

Add support for absolute paths from Nix store. This will allow grc to
apply configs to direct execution of
`/nix/store/*-package-1.0.0/bin/hello` paths and not just PATH
expansion.

pkgs/tools/misc/grc/default.nix

@@ -21,6 +21,10 @@ buildPythonApplication rec {
       substituteInPlace $f \
         --replace /usr/local/ $out/
     done
+
+    # Support for absolute store paths.
+    substituteInPlace grc.conf \
+      --replace "^([/\w\.]+\/)" "^([/\w\.\-]+\/)"
   '';
 
   nativeBuildInputs = [ installShellFiles ];