Add small .bat script to copy & fix DJGPP's libc
examples: Add GDSL hash table example
examples: Add some informational output to GD & big_int examples
CRT headers: Protect against duplicate ssize_t definitions

(problem observed when building the FB test suite for DOS)
GD headers: Add #inclibs for dependencies

This makes static linking easier, and shouldn't make a difference when
using the DLL or shared lib.
headers: Fix bz2 header to use stdcall on Win32
headers: Fix function name conflicts in bz2 header
examples: Add libbz2 compression example
bz2 header: Add ALIASes to counter the changed function names