5910 libnisdb won't build with modern GCC
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: "Toomas Soome" <tsoome@me.com>
Approved by: Dan McDonald <danmcd@omniti.com>

6267517 gcc/g++ and cmd/ldap don't get along
6269029 cmd/ypcmd and gcc don't get along
6271235 gcc and cmd/ldapcachemgr don't get along
6274678 gcc and libnisdb don't get along

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