fuchsia: Fix Wconversion on Mac/iOS builds (take two)

Followup to:
https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2373376

This time tested the changed code path.
Sorry for the sloppy changes. Thank you for your patience.

Bug: fuchsia:56258
Change-Id: I14a92b0662ff41a85d7123023ec883b5fd36b596
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2381081
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>
GitOrigin-RevId: 364fdd65a01ecc0ffd0985b4e1dfb57161328573
diff --git a/compat/BUILD.gn b/compat/BUILD.gn
index 6da9de3..2436b84 100644
--- a/compat/BUILD.gn
+++ b/compat/BUILD.gn
@@ -57,7 +57,7 @@
     # static_library.
     group(target_name) {
       forward_variables_from(invoker, "*")
-      not_needed(invoker, ["configs"])
+      not_needed(["configs"])
     }
   } else {
     static_library(target_name) {