[patch] getcwd needs size argument on solaris

[Nils Goroll]

Hi,

on (Open)Solaris, test m00000.vtc will fail because of getcwd(NULL, 0) in vtc.c
returning NULL.

from getcwd(3C) :

     If buf is a null pointer, getcwd()  obtains  size  bytes  of
     space using malloc(3C). The pointer returned by getcwd() can
     be used as the argument in a subsequent call to free().

Thanks, Nils
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