Description of problem:
As part of my work on DNF per the Mageia feature[0] (which, while it is currently in the proposed stage, I have no reason that I couldn't at least start working on getting things built), I have found that I cannot build hawkey against the included libsolv simply because the necessary header and linking data doesn't exist due to not having "-DENABLE_RPMMD=1" passed in at build for the package.

[0]: https://wiki.mageia.org/en/Feature:Add_DNF_as_Alternate_Repository_Manager

Version-Release number of selected component (if applicable):
libsolv-0.6.12-0.20150916.1.mga6

How reproducible:
Always

Steps to Reproduce:
1. Try building hawkey
2. Watch it fail due to missing headers and link data

Suggested solution:
Simply add "-DENABLE_RPMMD=1" to the build flags passed in at %cmake in the %build step, and it works fine. It doesn't affect anything and simply adds missing functionality that hawkey requires.

Reproducible: 

Steps to Reproduce: