WIP: spatialite GUI

[missinglink]

I've been playing around with getting spatialite-gui to compile.
It's currently failing to install librasterlite2 on my system with:

../headers/rasterlite2_private.h:376:2: error: unknown type name 'time_t'
        time_t last_used;
        ^
In file included from rl2gif.c:In file included from rl2jpeg.c:59:
57:
../headers/rasterlite2_private.h:376:2: ../headers/rasterlite2_private.h:376:2: error: unknown type name 'time_t'
        time_t last_used;
        ^
error: unknown type name 'time_t'
        time_t last_used;
        ^

I'm going to leave this open and it'll get resolved at some point, but it's not important