Embedded compilers doesn't like _A, _B, and _C function names.

[kisvegabor]

Hi,

I'm not sure why, but I get an error for these 3 function names. Maybe these are reserved or used internally somewhere. I got this with error with multiple compilers.

/home/kisvegabor/projects/lvgl/esp-workspace/esp-bsp/examples/display_lvgl_demos/components/lvgl/src/libs/thorvg/tvgLottieInterpolator.cpp:44:21: error: expected unqualified-id before numeric constant
   44 | static inline float _B(float aA1, float aA2) { return 3.0f * aA2 - 6.0f * aA1; }
      |                     ^~

Renaming the function to tvg_A, tvg_B, and tvg_C solves the issue. Basically adding any letter before the _ is fine.