[Bug libc/22099] getconf help info

["eblake at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22099

--- Comment #4 from Eric Blake <eblake at redhat dot com> ---
Output according to the POSIX recommendation would be:

$ getconf -a | head -n2
LINK_MAX:                           127
_POSIX_LINK_MAX:                    127

the whitespace can be arbitrary, but as none of the category names can include
a colon, and since a colon is unlikely in the contents of a confstr value
(although some values are blank), it would make it more obvious that the
following subset of the output represents exactly 8 of the many known keys:

$ getconf -a | grep -C4 POSIX_V7_WIDTH
POSIX_V7_ILP32_OFF32_CFLAGS:        -m32
POSIX_V7_ILP32_OFF32_LDFLAGS:       -m32
POSIX_V7_ILP32_OFF32_LIBS:          
POSIX_V7_ILP32_OFF32_LINTFLAGS:     
_POSIX_V7_WIDTH_RESTRICTED_ENVS:    POSIX_V7_ILP32_OFF32
POSIX_V7_ILP32_OFFBIG
POSIX_V7_LP64_OFF64
POSIX_V7_WIDTH_RESTRICTED_ENVS:     POSIX_V7_ILP32_OFF32
POSIX_V7_ILP32_OFFBIG
POSIX_V7_LP64_OFF64
_POSIX_V7_ILP32_OFFBIG:             1
POSIX_V7_ILP32_OFFBIG_CFLAGS:       -m32 -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64

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