treewide: format repo with buildifier

Change-Id: Ia7aebeb7bba5b119c9157d1ad805cc477bcbb68a
Reviewed-on: https://review.monogon.dev/c/monogon/+/3774
Tested-by: Jenkins CI
Reviewed-by: Leopold Schabel <leo@monogon.tech>
diff --git a/version/defs.bzl b/version/defs.bzl
index d0e439b..671bc54 100644
--- a/version/defs.bzl
+++ b/version/defs.bzl
@@ -1,8 +1,6 @@
 load(
     "@io_bazel_rules_go//go:def.bzl",
-    "GoLibrary",
     "go_context",
-    "go_library",
 )
 
 def _go_version_library_impl(ctx):
@@ -61,7 +59,7 @@
         ),
         "_genversion": attr.label(
             default = Label("//version/stampgo"),
-            cfg = "host",
+            cfg = "exec",
             executable = True,
             allow_files = True,
         ),