* zlib: add package
* add zlib to dependencies where needed
* aapt: fix compilation error after adding own zlib
* fossil: specify zlib installation
* fossil: specify CPPFLAGS
* exa: fix build error where zlib.h was not found
* bat: fix build error where zlib.h was not found
* lftp: specify correct zlib location
* zlib-dev: breaks and replaces old ndk-sysroot
also bump toolchain version for z{lib,conf}.h removal
* texlive-bin: fix compilation errors
This fixes Android 6 problems (so closes#26).
It also rebuilds termux-elf-cleaner when needed
and bumps some build revisions for packages
needed updates to remove DT_VERDEF and DT_VERDEFNUM.