Linux build failing on missing SDL symbol X11_KeyToUnicode

[hpvb]

$ make release64
Linking Torque6
==== Building Torque6App (release64) ====
Linking Torque6App
../bin/libTorque6.so: undefined reference to `X11_KeyToUnicode'

There are some bugs against Torque2d as well.

[hpvb]

It would seem that porting to SDL2 for UNIX at least would solve this problem, as it has some facilities to convert from scancodes to unicode built in.