wxwidgets: added libxinerama to DEPENDS

wxwidgets: added libxinerama to DEPENDS

| ./src/unix/displayx11.cpp:49:41: error: X11/extensions/Xinerama.h: No such file or directory
| ./src/unix/displayx11.cpp:72: warning: ISO C++ forbids declaration of 'type name' with no type
| ./src/unix/displayx11.cpp:72: error: 'operator const int' does not name a type
| ./src/unix/displayx11.cpp:77: warning: ISO C++ forbids declaration of 'XineramaScreenInfo' with no type
| ./src/unix/displayx11.cpp:77: error: expected ';' before '*' token

Signed-off-by: Matt Thompson <matthewbot@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>