add a batch version for the dependency reporting (#126)

This commit adds a Windows alternative to the dependency_report.sh.

devtools/3rd_party/dependency_report.bat

@@ -0,0 +1,58 @@
+@echo off
+rem
+rem Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+rem or more contributor license agreements. Licensed under the Elastic License;
+rem you may not use this file except in compliance with the Elastic License.
+rem
+
+rem
+rem Create a CSV file listing the information about our 3rd party dependencies
+rem that is required for the stack-wide list.
+rem
+rem Usage:
+rem dependency_report.bat --csv <output_file>
+rem
+rem The format is that defined in https://github.com/elastic/release-manager/issues/207,
+rem i.e. a CSV file with the following fields:
+rem
+rem name,version,revision,url,license,copyright
+rem
+rem The way this script works, each component must have its own CSV file with
+rem those fields, and this script simply combines them into a single CSV file.
+rem Because of this, the field order is important - in each per-component CSV
+rem file the fields must be in the order shown above.
+
+setlocal EnableExtensions EnableDelayedExpansion
+
+if /i [%1] == [--csv] (
+	set OUTPUT_FILE=%2
+)
+
+if [%OUTPUT_FILE%] == [] (
+    echo Usage: %~0 --csv ^<output_file^>
+	exit /b 1
+)
+
+cd %~dp0
+
+rem IMPORTANT: this assumes all the *INFO.csv files have the following header:
+rem
+rem name,version,revision,url,license,copyright
+
+set FIRST=yes
+for %%i in (licenses\*INFO.csv) do (
+	if [!FIRST!] == [yes] (
+		set FIRST=no
+		rem "|| rem": set errorlevel
+		type %~dp0\%%i > %OUTPUT_FILE% || rem
+		if ERRORLEVEL 1 (
+			exit /b 1
+		)
+	) else (
+		findstr /v "^name," %~dp0\%%i >> %OUTPUT_FILE%
+	)
+)
+
+endlocal
+
+