Travis: check that the project compiles by including everything and completely ignoring the normal autotools way.
Travis: check that the project compiles by including everything
and completely ignoring the normal autotools way.

This is completely unsupported, but some projects use it that
way no matter what.

eburkitt/libsodium,rustyhorde/libsodium,eburkitt/libsodium,rustyhorde/libsodium,rustyhorde/libsodium,Payshares/libsodium,Payshares/libsodium,pmienk/libsodium,pmienk/libsodium,rustyhorde/libsodium,eburkitt/libsodium,Payshares/libsodium,pmienk/libsodium