Added git function to retrieve current hash.
Fixed git TAG matching, falling back to short hash if no tag exists.
Setting windows version patch level to build number now.
Setting windows version description to GIT_REVISION.
Initializing BUILD_NUMBER variable now.
Fixed setting of RV_VERSION_PATCH, now BUILD_NUMBER is used for every library.
Executable names are now correctly set, using CMAKE_EXECUTABLE_SUFFIX now.
Fixed version defines for winpr executables.
Using global RC_VERSION_PATCH now.