[WIN32] fixed: missing dlls for the mingw environment

while working on another project I noticed that some progs under mingw won't work as some dlls are missing. This PR will add those dlls. Even though it looks like that the not working progs aren't required to compile our mingw libs its better to have those.
Test build is running here:
http://jenkins.xbmc.org/job/XBMC-WIN-32/302/console