[XeTeX] How to tell Xetex don't embed some ttf font into pdf

[姚春林]

Thank you ,every one.

The primary OS for our company is WinXP.
The widely used East Asian's font SimSun,SimHei,Mincho,Gothic are
shipped with XP.
If you select the language from  'Region and Language Settings' in
control panel,the font will be installed.

Because Asia font often have large size,embed these font will cause
file size bigger.
The pdf file is often  used  internally,And transferred by email.

Chunlin