Little improvements for make_install.bat.

1. Detect Windows version and set UTF-8 codepage if Windows 7 or higher.
2. Write error message if build finished successful, but a package was not
created.
3. Check if exists "build" directory and remove it before new build.

--HG--
branch : develop

scripts/make_install.bat

@@ -1,5 +1,15 @@
 rem script helps create installer
 
+rem detect windows version
+ver | find "6.1" > nul
+
+IF ERRORLEVEL = 1 GOTO ARCHITECTURE
+IF ERRORLEVEL = 0 GOTO WIN7
+
+:WIN7
+chcp 65001
+
+:ARCHITECTURE
 rem find target architecture
 reg Query "HKLM\Hardware\Description\System\CentralProcessor\0" | find /i "x86" > NUL && set ARCHITECTURE=32BIT || set ARCHITECTURE=64BIT
 
@@ -8,6 +18,7 @@ if %ARCHITECTURE%==32BIT set nsis_path="C:/Program Files/Inno Setup 5/iscc.exe"
 if %ARCHITECTURE%==64BIT set nsis_path="C:/Program Files (x86)/Inno Setup 5/iscc.exe"
 
 if not exist %nsis_path% (
+	SET package_error="Package was not created!"
 	SET /P promt="Coudn't find Inno Setup. Do you want to continue?[Y\N]"
 	IF "%promt%" == "Y" GOTO PREPARE
 	IF "%promt%" == "y" GOTO PREPARE
@@ -19,7 +30,11 @@ cd ..
 cd
 rem force qmake create new qm files
 del /Q share\translations\*.qm
-mkdir build
+IF exist build ( 
+	echo Build exists. Clearing.
+	rd /s /q build
+) 
+mkdir build && echo build created
 cd build
 cd
 
@@ -54,5 +69,6 @@ echo Failed to make the first run qmake!
 @pause
 exit /b 1 
 :ONEXIT
-echo Done!
+echo Done! %package_error%
 @pause
+