Add CMakeLists.txt from https://github.com/madler/zlib/releases/tag/v1.2.5 to tests/zlib to be able to build it on Windows via CMake.
Delete tests/zlib/zconf.h file from the zlib source tree, since it is an automatically generated file during configure step. Add Emscripten-specific mod to make zlib CMakeLists.txt build succeed.
Use CMake to build zlib in test other.test_outline on Windows. This test did not pass since 'sh ./configure' was attempted to build on Windows.
Merge pull request #1800 from juj/fix_test_outline

Fix test_outline on Windows.