gcc: add caveats about broken openmp multilib

Closes #29670.
lmdb: use git tag since the tarball is constantly changing
mongodb: use new yaml config format

Closes #31115.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
gettext, readline: Add keg_only :shadowed_by_osx

Closes #31951.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
add current devel/unstable release (9.10.1b2)
trim sneaky spaces
bind: update 9.10.0-P2_1 bottle.
mongodb: update 2.6.4_1 bottle.