_stricmp() on that platform, use the appropriate header file for it,
<string.h>.
o_str.h: we only want to get size_t, which is defined in <stddef.h>.
Philippe Bougeret <philippe.bougeret@freesbee.fr> notified us about Windows
not having a <strings.h>
platforms that don't (necessarely) have it. In the case of VMS, this
means moving a couple of functions from apps/ to crypto/ and make them
general (although only used privately).
