Add symchk to download PDBs

Installer/win32_download_windows_symbols_pdb.bat

@@ -0,0 +1,19 @@
+@echo off
+set dest_dir="%~dp0Windows_Symbols_PDBs"
+set symchk="C:\Program Files (x86)\Windows Kits\10\Debuggers\x64\symchk.exe"
+
+if "%~1"=="" goto :usage
+
+if not exist %symchk% (
+    echo Symchk binary not found but is required to run script [path=%symchk%]
+    exit /b 1
+)
+goto :eof
+
+if not exist %dest_dir% mkdir %dest_dir%
+echo Downloading to %dest_dir% with %symchk%
+%symchk% /r "%1" /s srv*%dest_dir%*https://msdl.microsoft.com/download/symbols
+goto :eof
+
+:usage
+echo Usage: download_windows_symbol_pdb.bat executable_to_check