experimental SDL2 support in FIM

[Michele Martone]

Dear friends of FIM - Fbi IMproved,

I just introduced SDL2 support in FIM.
It relies on the presence of sdl2-config being installed.

 fim -V | grep SDL2 # expect /usr/include/SDL2 or similar
 ldd fim | grep SDL2 # expect to see libSDL2-2.0.so.0 or similar


I'd appreciate feedback on whether it works as it should -- 
especially in keyboard input under different window managers:

 * lower case keys
 * upper case keys
 * function keys
 * symbols via shift-key combinations
 * CTRL+keys
 * if the arrows work in the console (after pressing ':')

It's in the repo, from r1979
 http://svn.savannah.nongnu.org/svn/fbi-improved/branches/0.6

please let know if it's fine, whether here on the mailing list,
or in private.

Cheers,
Michele

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