Added missing queue macros for building on Android

[triplef]

TAILQ_CONCAT() and LIST_FOREACH_SAFE() are not defined in queue.h in the Android NDK.

I simply added the macros to internal.h, but please let me know if you’d prefer another place to add them.

[compnerd]

This is insufficient, there are additional ones, #453 covers this as well.

[triplef]

The thing is that (probably unlike Windows) the Android NDK implements some of these macros, but not all of them. I see a couple of alternate ways that I think should work and would probably be better than just sticking them in internal.h like I did here:

a) Add missing macros to android_stubs.h.
b) Wait for #453, then include generic_sys_queue.h on Android and don’t include sys/queue.h.
c) Wait for #453, then include generic_sys_queue.h and add #ifndef’s around each definition.

Do any of these approaches sound good or is there another way you’d prefer?

[compnerd]

I'm totally happy with b. It seems much nicer. The file is already annoying to work with, so c isn't very appealing. a would really increase the duplication, so I really think b is the best approach.

[triplef]

Sounds good! I’ll wait for #453 and re-do this.

[compnerd]

@triplef - #453 is merged :-)

[triplef]

Thanks! :) I’ve updated the patch as discussed.

[compnerd]

@swift-ci please test

[compnerd]

CC: @ktopley-apple