plugin API: Let error.h be included directly if wanted.
plugin API: Let error.h be included directly if wanted.

There is no point in now allowing error.h to be included directly.

Ziemin/telepathy-gabble,jku/telepathy-gabble,jku/telepathy-gabble,Ziemin/telepathy-gabble,jku/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,mlundblad/telepathy-gabble,mlundblad/telepathy-gabble,mlundblad/telepathy-gabble