fuchsia: Fix Wconversion on Mac/iOS builds

Followup to:
https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2345384

Bug: fuchsia:56258
Change-Id: If2aa04470219a0db1934e4eae9387d4fe6f04105
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2373376
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Mark Mentovai <mark@chromium.org>
GitOrigin-RevId: dc9f3a58aabb69db03b6e778a316bd0cb57d0d49
diff --git a/compat/BUILD.gn b/compat/BUILD.gn
index d3045eb..6da9de3 100644
--- a/compat/BUILD.gn
+++ b/compat/BUILD.gn
@@ -57,6 +57,7 @@
     # static_library.
     group(target_name) {
       forward_variables_from(invoker, "*")
+      not_needed(invoker, ["configs"])
     }
   } else {
     static_library(target_name) {