Bug 1406140 - Simplify a bit the code to have a single call to build_…

…tar_package r=andi

MozReview-Commit-ID: 9yGw8bJhQwR

--HG--
extra : rebase_source : e3ed5144a8bbdd6e3bba27d97decd6935904e3cb

build/build-clang/build-clang.py

@@ -582,7 +582,5 @@ def checkout_or_update(repo, checkout_dir):
         prune_final_dir_for_clang_tidy(os.path.join(final_stage_dir, "clang"))
         package_name = "clang-tidy"
 
-    if is_darwin() or is_windows():
-        build_tar_package("tar", package_name + ".tar.bz2", final_stage_dir, "clang")
-    else:
-        build_tar_package("tar", package_name + ".tar.xz", final_stage_dir, "clang")
+    ext = "bz2" if is_darwin() or is_windows() else "xz"
+    build_tar_package("tar", "%.tar.%s" % (package_name, ext), final_stage_dir, "clang")