pr-apple-llvm-project-linux: Set linker to clang

Clang is defaulting to the bfd linker in the PR job, resulting in test
failures due to failure to link. Switching it to gold.

Author: etcwilde

utils/build-presets.ini

@@ -1776,6 +1776,8 @@ skip-test-osx
 
 [preset: pr_apple_llvm_project_linux]
 
+llvm-cmake-options=-DCLANG_DEFAULT_LINKER=gold
+
 foundation
 libicu
 libdispatch