[PATCH] Use memcpy() rather than strcpy() in strdup()

[Peter Kjellerstedt]

Does anyone have any objections to me applying the attached patch?
It makes strdup() use memcpy() rather than strcpy() to duplicate
the string.  The rationale is that we already have the length of
the string to duplicate (from doing the malloc()), and I believe
memcpy() should then always be faster than strcpy() (or at least
as fast).

//Peter
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