Added build_opt scripts for recipe hook feature

stm32duino/Arduino_Core_STM32#41

Signed-off-by: Frederic Pillon <[email protected]>

Author: fpistm

win/build_opt.bat

@@ -0,0 +1,17 @@
+@echo off
+set optinname=build_opt.h
+set optoutname=build.opt
+
+set sketchname=%1
+set optinpath=%2
+set optinpath=%optinpath:/=\%
+set input=%optinpath%\%optinname%
+set optoutpath=%3
+set optoutpath=%optoutpath:/=\%
+set dest=%optoutpath%\%optoutname%
+
+if exist %input% (
+    copy "%input%" "%dest%" /Y
+) else (
+   type NUL > %dest%
+)