Macros starting with `g' in bsd/hfs

• GetTextEncodingBasePriv bsd/hfs/hfs_macos_defs.h:1496
• GetTextEncodingFormatPriv bsd/hfs/hfs_macos_defs.h:1500
• GetTextEncodingVariantPriv bsd/hfs/hfs_macos_defs.h:1498