Restore nuget packages before building
Restore nuget packages before building

This is necessary for building with msbuild 16.8.

sillsdev/libpalaso,ermshiperete/libpalaso,ermshiperete/libpalaso,gmartin7/libpalaso,sillsdev/libpalaso,gmartin7/libpalaso,ermshiperete/libpalaso,gmartin7/libpalaso,sillsdev/libpalaso,gmartin7/libpalaso,sillsdev/libpalaso,ermshiperete/libpalaso