Bazel: add codeql specific packaging library

This encapsulate arch specific logic, local installation and separation
of zip files into generic and arch-specific parts as required by the
internal build.

swift/tools/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@rules_pkg//pkg:mappings.bzl", "pkg_attributes", "pkg_filegroup", "pkg_files")
+load("//misc/bazel:pkg.bzl", "codeql_pkg_files")
 
 sh_binary(
     name = "qltest",
@@ -16,29 +16,17 @@ sh_binary(
     srcs = ["identify-environment.sh"],
 )
 
-pkg_files(
-    name = "scripts",
+codeql_pkg_files(
+    name = "tools",
     srcs = [
         "autobuild.cmd",
+        "tracing-config.lua",
+    ],
+    exes = [
         ":autobuild",
         ":identify-environment",
         ":qltest",
     ],
-    attributes = pkg_attributes(mode = "0755"),
     prefix = "tools",
-)
-
-pkg_files(
-    name = "tracing-config",
-    srcs = ["tracing-config.lua"],
-    prefix = "tools",
-)
-
-pkg_filegroup(
-    name = "tools",
-    srcs = [
-        ":scripts",
-        ":tracing-config",
-    ],
     visibility = ["//swift:__pkg__"],
 )