Skip shading for lightsources and top of the nodes.
Fixes liquid sources and flowing surfaces having different brightness.

This can delay connections by several minutes.

https://github.com/minetest/minetest/issues/1527

Add ZLIBWAPI_DLL and LEVELDB_DLL CMake options Remove legacy MINGWM10_DLL CMake option Update 32-bit buildbot (OpenAL updated, zlib updated) Change build directory for buildbots to '_build' to prevent removal of Android build files Use -win64 suffix for 64-bit Windows builds Fixes #1476

Fixes https://github.com/minetest/minetest/issues/1514

These were initially added to get tracebacks for invalid vector errors, but it
didn't work and tracebacks have since been properly fixed in the core.

Fix android makefile to provide a correct dummy githash if detection fails

Improve error handling in saveBlock()