add Allow user define RLOTTIE_API macros.

[mingkuang-Chuyu]

We can compile the static library by defining the RLOTTIE_API macro.

: )

Best

mingkuang

[hermet]

Could you please explain which scenario requires this define?

[donno]

Could you please explain which scenario requires this define?

The scenario that requires this define is being able to compile rlottie as a static library such that you can define RLOTTIE_API and avoid the dllimport on Windows.

The alternative would be introduce a separate define for that such as RLOTTIE_STATIC or (RLOTTIE_NO_DLL) which then defines RLOTTIE_API to nothing for the same effect.