buildGoModule: remove goPackagePath warning

As buildGoPackage was removed, it is unlikely for attributes of
buildGoModule to get mixed up with those of buildGoPackage.

Signed-off-by: Paul Meyer <49727155+katexochen@users.noreply.github.com>

pkgs/build-support/go/module.nix

@@ -46,9 +46,6 @@
   # Meta data for the final derivation.
 , meta ? { }
 
-  # Not needed with `buildGoModule`.
-, goPackagePath ? ""
-
   # Go linker flags.
 , ldflags ? [ ]
   # Go build flags.
@@ -61,8 +58,6 @@
 , ...
 }@args':
 
-assert goPackagePath != "" -> throw "`goPackagePath` is not needed with `buildGoModule`";
-
 let
   args = removeAttrs args' [ "overrideModAttrs" "vendorSha256" ];