[misc] separated ms-sys dependency from application

* set ms-sys to be built as a library
* also removed unused code from badblocks.c

wdk_build.cmd

@@ -18,7 +18,23 @@ set PWD=%~dp0
 set ARCH_DIR=%_BUILDARCH%
 if /I Test%_BUILDARCH%==Testx86 set ARCH_DIR=i386
 
-cd src
+::# MS-SYS Library
+cd src\ms-sys
+if EXIST Makefile ren Makefile Makefile.hide
+
+copy .msvc\ms-sys_sources sources >NUL 2>&1
+
+@echo on
+%BUILD_CMD%
+@echo off
+if errorlevel 1 goto builderror
+copy obj%BUILD_ALT_DIR%\%ARCH_DIR%\ms-sys.lib . >NUL 2>&1
+
+if EXIST Makefile.hide ren Makefile.hide Makefile
+if EXIST sources del sources >NUL 2>&1
+
+::# Rufus Application
+cd ..
 if EXIST Makefile ren Makefile Makefile.hide
 
 copy .msvc\rufus_sources sources >NUL 2>&1