Fix warning about memmove redefinition

[Vincent Béron]

When compiled under gcc 4 with both -O2 and -Wp,-D_FORTIFY_SOURCE=2
(part of default CFLAGS while building RPMS under FC4), gcc complains
about redefining memmove as memmove is a #define somewhere in
/usr/include/bits/string3.h (it's an inline version with protection).

With these settings, gcc also complains about a couple of functions
which return values are not checked although they ought to (like
system(), strtoul(), sscanf(), etc.). I'll provide a list to wine-devel
shortly.

Maybe we can mark some of Wine's functions as "must check return code"
as well?

Changelog:
Fix warning about memmove re#definition.

Vincent
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