neo4j: better headless mode

neo4j server by defaults opens an empty java gui which does nothing
beyond stealing focus. there's no need for this, so turn it off

Closes #24077.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
xcode: fix nil outdated comparison.
fping 3.8

Closes #24085.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
elb-tools 1.0.23

Closes #24088.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
hbase 0.94.13

Closes #24092.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
erlang: mark as always failing with llvm

There is always a better alternative than llvm-gcc available (clang on
Xcode 4.3+, gcc-4.2 elsewhere), so let's get rid of this hack (who wants
an unoptimized erlang built with llvm-gcc, anyway?)
cairo: add missing deps
erlang: disable silent rules
erlang: work around superenv bug

I don't want to bottle this quite yet since I think a fix in superenv is
imminent.

Fixes #23754.