Configure warnings

[Steve Garrett]

Configuring on Solaris 10  with configure options ./configure -prefix=/opt/samba-3.5.6 -with-bundled-popt

configure: WARNING: sys/mode.h: present but cannot be compiled
configure: WARNING: sys/mode.h:     check for missing prerequisite headers?
configure: WARNING: sys/mode.h: see the Autoconf documentation
configure: WARNING: sys/mode.h:     section "Present But Cannot Be Compiled"
configure: WARNING: sys/mode.h: proceeding with the preprocessor's result
configure: WARNING: sys/mode.h: in the future, the compiler will take precedence
configure: WARNING:     ## ---------------------------------------- ##
configure: WARNING:     ## Report this to samba-technical at samba.org ##
configure: WARNING:     ## ---------------------------------------- ##