Add query functions to request FTGL configuration information:
- C version: ftglGetString();
- C++ version: FTGL::GetString();
Currently supported strings are:
- FTGL_CONFIG_VERSION: FTGL version information
Correct the order in which FT_Done_Face is called via the library's
destructors. Fixes a Bzflag crash upon exit. Patch courtesy of Mathew Eis
(kingrobot) from SF patch 2721799.