For cube maps, texture->target is GL_TEXTURE_CUBE_MAP and would be used for
calls that apply to the entire texture, like glTexParameter().
surface->texture_target refers to individual faces like
GL_TEXTURE_CUBE_MAP_POSITIVE_X, etc., and would be used for calls like
glTexImage2D(). What makes this a bit ugly is the fact that surfaces don't
always have an associated texture.

Based on original patch from Christian Lupien.

usp10: Change OpenType_GSUB_GetFontFeatureTags to OpenType_GetFontFeatureTags and load features from GPOS table.

usp10: Change OpenType_GSUB_GetFontLangaugeTags to OpenType_GetFontLanguageTags and load languages from GPOS table as well.

usp10: Change OpenType_GSUB_GetFontScriptTags to OpenType_GetFontScriptTags and load scripts from GPOS table as well.