embedded libtool breaks 'gem install libv8'

[lamont-granquist]

with embedded/bin in the path I get this:

Installing libv8 3.16.14.13 with native extensions

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/lamont/.rvm/gems/ruby-2.2.4/gems/libv8-3.16.14.13/ext/libv8
/Users/lamont/.rvm/rubies/ruby-2.2.4/bin/ruby -r ./siteconf20160215-7355-i8vs4r.rb extconf.rb --with-cxx=clang++
creating Makefile
Compiling v8 for x64
Using python 2.7.10
Using compiler: /usr/bin/clang++ (clang version 7.0.2)
libtool: unrecognized option `-static'
libtool: Try `libtool --help' for more information.
make[1]: *** [/Users/lamont/.rvm/gems/ruby-2.2.4/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/libpreparser_lib.a] Error 1
make: *** [x64.release] Error 2

this is caused by:

% which libtool
/opt/chefdk/embedded/bin/libtool
% libtool --version
libtool (GNU libtool) 2.4.2
Written by Gordon Matzigkeit <gord@gnu.ai.mit.edu>, 1996

Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

it needs to be:

% libtool -V
Apple Inc. version cctools-877.8

or else gem install libv8 picks up clang++ from the system, and libtool from chef-dk and then gets very confused...

@scotthain this is probably why all these build time deps need to be removed from chef and chef-dk omnibus projects and put into the omnibus-build-toolchain instead.

[scotthain]

@lamont-granquist I'm all for it.

[lamont-granquist]

this is also basically a dup of #313

[cheeseplus]

Closing in favor of https://github.com/chef/chef-dk/issues/313