warning when configuring wine-20040716 on OpenBSD 3.5+

[Angelos D. Keromytis]

configure: WARNING: sys/sysctl.h: present but cannot be compiled
configure: WARNING: sys/sysctl.h:     check for missing prerequisite headers?
configure: WARNING: sys/sysctl.h: see the Autoconf documentation
configure: WARNING: sys/sysctl.h:     section "Present But Cannot Be Compiled"
configure: WARNING: sys/sysctl.h: proceeding with the preprocessor's result
configure: WARNING: sys/sysctl.h: in the future, the compiler will take 
precedence
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to wine-devel(a)winehq.org ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/sysctl.h... yes