Seems there is a buffer overflow in x11vnc's tightvnc-filetransfer
code when compiling to 64 bits: a buffer is allocated using sizeof(int)
for the size, but then, data is copied into it using
sizeof(unsigned long).

Detected by GCC build with full warnings.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>