xcbuild: const can't desctruct. fix build

build failed on clang-19
fixes 82a00b78e4

pkgs/by-name/xc/xcbuild/patches/Use-system-toolchain-for-usr-bin.patch

@@ -12,7 +12,7 @@ diff -Naur a/Libraries/xcsdk/Tools/xcrun.cpp b/Libraries/xcsdk/Tools/xcrun.cpp
  using libutil::FSUtil;
  
 +namespace {
-+  const std::vector<const std::string> kSystemDeveloperDirs = {
++  const std::vector<std::string> kSystemDeveloperDirs = {
 +    "/private/var/select/developer_dir",
 +    "/private/var/db/xcode_select_link"
 +  };