Add `FT_PARAM_TAG_IGNORE_SBIX`.

This is another bit to handle 'sbix' tables as described in the OpenType
specification.

* include/freetype/ftparams.h (FT_PARAM_TAG_IGNORE_SBIX): New macro.

* src/sfnt/sfobjc.c (is_apple_sbix): Rename to...
(has_sbix): ... this.
Check for more sbit tables.
Handle `FT_PARAM_TAG_IGNORE_SBIX` to eventually control `has_sbix`.
Only call sbit table loader if an sbit table is present.
2 files changed