Use libdeflate instead of zlib

[iliaplatone]

No description provided.

[e-n-f]

Thanks for the contribution. As you can see, the build is breaking due to the missing dependency, which will need to be installed in .travis.yml. Could you please also make indent to keep the formatting consistent with other source code? Thanks!

[iliaplatone]

I made many commits, there is still an error during test phase, I think this is not an error of my code.
[code]
./tippecanoe -q -a@ -f -o tests/longlayer/out/-z0.json.check.mbtiles -z0 tests/longlayer/in.json < /dev/null
./tippecanoe-decode -x generator tests/longlayer/out/-z0.json.check.mbtiles > tests/longlayer/out/-z0.json.check.out
PBF decoding error in tile 0/0/0
make: *** [tests/longlayer/out/-z0.json.check] Error 1
The command "docker run -it tippecanoe-image" exited with 2.
[/code]

[e-n-f]

Thanks. I'll take a look and see if I can understand what is going wrong with that tile.

[Plantain]

This won't build on OSX/Clang/llvm currently:
c++ -MMD -I/usr/local/include -I. -Ilibdeflate -g -O3 -DNDEBUG -std=c++11 -c -o mvt.o mvt.cpp
mvt.cpp:48:33: error: arithmetic on a pointer to void
next_out = (void *) (next_out + existing_output);
~~~~~~~~ ^

[Plantain]

Interestingly the file sizes are coming out considerably larger with libdeflate. I am investigating why that might be.
-rw-r--r-- 1 plantain staff 1556480 21 Dec 18:07 out.mbtiles
-rw-r--r-- 1 plantain staff 1064960 21 Dec 17:37 out.old.mbtiles

[iliaplatone]

Sorry for these commits, maybe this last commit will fix the compression error

[Plantain]

The new commits have the void pointer arithmetic issue again:
mvt.cpp:84:33: error: arithmetic on a pointer to void
next_out = (void *) (next_out + increase);
~~~~~~~~ ^
mvt.cpp:85:31: error: arithmetic on a pointer to void
next_in = (void *) (next_in + increase * 2);
~~~~~~~ ^

[iliaplatone]

Sorry for these commits, maybe this last commit will fix the compression error

[Plantain]

This is not generating valid mbtiles in the current state - tiles generated are just hundreds of kb of null bytes.