Updates gnuplot to version 4.4.4.
Adds optional wx dependency support.
Adds CVS development head with autotools invocation.
Adds very simple test for gnuplot binary version.
Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Parallel builds fail if lua is compiled with LLVM,
so a previous commit flagged Lua as "fails_with_llvm".
Re-enabled parallel builds, as they work fine against a
GCC-build lua.
brewkit.rb changes ENV destructively, so lets not do that everytime a formula
is required. Now it's possible for other tools to require a formula
description without worrying about side-effects.
