Make check-flagged-apis executable

Occasionally sourcing the script would close my overall shell when it
hit an error. By having it just be an executable script, this prevents
it from impacting a user's normal shell environment and can depend on it
always being bash, rather than whatever shell people happen to be using.

Bug: 334870672
Test: tools/check-flagged-apis/check-flagged-apis.sh
Change-Id: Ic46cb4fefdea8d51be018d4f7a92b0d9ca7e57b3

tools/check-flagged-apis/check-flagged-apis.sh

@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # Copyright (C) 2024 The Android Open Source Project
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -15,6 +17,13 @@
 # Run check-flagged-apis for public APIs and the three @SystemApi flavours
 # Usage: lunch <your-target> && source <this script>
 
+source $(cd $(dirname $BASH_SOURCE) &> /dev/null && pwd)/../../shell_utils.sh
+require_top
+
+function m() {
+    $(gettop)/build/soong/soong_ui.bash --build-mode --all-modules --dir="$(pwd)" "$@"
+}
+
 function build() {
     m sdk dist && m \
         check-flagged-apis \