Camel: Fix linking issue.
Camel: Fix linking issue.

camel-enumtypes.c is linked into libcamel.so, but is needed by
camel-network-settings.c which is part of libcamel-provider.so,
and libcamel-provider.so is lower in the dependency chain.

Move camel-enumtypes.c into libcamel-provider.so.

ed. I don't understand why libcamel-provider.so even exists as a
    separate library, unless there's some hidden circular dependency
    I haven't tripped over yet.  Tempted to merge it into libcamel.so
    and see how it goes...

Distrotech/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,Distrotech/evolution-data-server,Distrotech/evolution-data-server,gcampax/evolution-data-server,Distrotech/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,tintou/evolution-data-server,gcampax/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,gcampax/evolution-data-server,gcampax/evolution-data-server,Distrotech/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server