fltk13: bump to latest

cross-compilation is broken:
Generating fast_slow.cxx and header from fast_slow.fl...
../fluid/fluid -c fast_slow.fl
../fluid/fluid: ../fluid/fluid: cannot execute binary file
make[1]: *** [fast_slow.cxx] Error 126

since this lib is only used by dillo, i didnt spend hours
trying to fix it.
fuse: fix x-compile