[Ecls-list] Patch for missing #includes

[Jerry James]

GCC complains about some functions with no prototypes.  The attached
patch fixes the problem.

cdata.d calls memcmp() and memcpy(), so needs <string.h>.

main.d calls memcpy(), so needs <string.h>.

num_rand.d calls read() and close() if !defined(ECL_MS_WINDOWS_HOST),
so needs <unistd.h>.

Regards,
-- 
Jerry James
http://www.jamezone.org/
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