Use unsigned int instead of enum type.

Don't use dpl_vfile_flag_t as type for flags in dpl_vfile_t as then you
can only store one enum type in it and we want to store a or-ed value.
Same is true for the mask field in dpl_option_t which needs to store
a or-ed set of dpl_option_mask_t enum values.
Add OBS spec file and install includes not in subdir.