Fix compilation for windows

printHash.bat

@@ -0,0 +1,26 @@
+@echo off
+
+REM creates version.h with HEAD commit hash
+REM params: $1=full path to output file (usually points version.h)
+
+setlocal enableextensions enabledelayedexpansion
+
+cd /d "%~dp0"
+
+break> %1
+
+<nul set /p=^"#define GIT_SHA1 ^"^"> %1
+
+where git
+if "%errorlevel%" == "0" ( goto :havegit ) else ( goto :writeending )
+
+:havegit
+for /f %%v in ('git rev-parse --short HEAD') do set version=%%v
+<nul set /p="%version%" >> %1
+
+:writeending
+
+echo ^" >> %1
+echo const char* g_GIT_SHA1 = GIT_SHA1; >> %1
+
+EXIT /B