[base] Added a public API to change the log handling function at run-time.
* include/freetype/ftlogging.h (FT_Custom_Log_Handler): New function
pointer to store the custom callback logging function.
(FT_Set_Log_Handler, FT_Set_Default_Log_Handler): New functions to set and
reset custom log handler.
* include/freetype/internal/ftdebug.h: Added variables to support custom
callback logging function.
(FT_Callback): A function to print log using custom callback logging
function, which is set using `FT_Set_Log_Handler'.
* src/base/ftdebug.c: Added support for handling custom logging callback
function.
(FT_Set_Log_Handler, FT_Set_Default_Log_Handler, FT_Callback): Added
function definitions.
3 files changed
