Make pywlauncher.vcxproj depend on make_versioninfo.vcxproj.

pylauncher.vcxproj already has the same dependency, and adding it to
the pywlauncher project eliminates the possibility of the pywlauncher
build failing when building the solution in parallel.  In particular,
pywlauncher may fail to build when doing a "Rebuild Solution" from the
VS Build menu.