-Wall on gcc8 otherwise warns without -Wno-cast-function-type but older
GCCs/CLang choke on that argument:
error: unknown warning option '-Wno-cast-function-type'; did you mean
'-Wno-bad-function-cast'? [-Werror,-Wunknown-warning-option]
This adds 24 byte to the binary, as some functions are now called with
additional dummy arguments:
"Pushing and popping garbage to keep the system happy"
Tested with x86_64-w64-mingw32-gcc-8.2.0 and cygwin gcc (GCC) 7.3.0.
Use libftdi1 unconditionally.
Try to convice github travis to use libftdi1.
Remove unportable "uint ". Thanks to jacereda for pointing out in #400.