lynx-dev Cosmetic glitch in configure

[pg]

Hello, Lyncei

The first time I run configure, with nothing cached, I see:

    checking for uid_t in sys/types.h... yes
    checking type of array argument to getgroups... gid_t
    checking for pid_t... yes
    checking for uid_t in sys/types.h... (cached) yes

Apparently the redundant check for uid_t causes it to be
reported as cached the second time.  Startling, but harmless.

-- gil