[Wiki] Add a comment to use xcodebuild to build from the command-line on OS X

[magreenblatt]

Original report by Paul Furbacher (Bitbucket: Paul Furbacher).

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On the BranchesAndBuilding page, in the first item of the section titled "Manual Building", you could add after the following comment:

# Open jcef.xcodeproj in Xcode and select Product > Build.```

a comment on how to build using xcodebuild on the command line:

# In the 'jcef_build' directory, execute 
# xcodebuild -project jcef.xcodeproj/ -configuration Release -target ALL_BUILD
# This requires Xcode Command-Line Tools to have been installed.

If this comment is added, it might be useful to add a link in the "For Mac OS X platforms:" section about installing the command-line tools. Something like

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• Xcode Command-line Tools if you want to build the xcodeproject from the command-line: in Terminal, invoke:
  $ xcode-select --install

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Using the command line saves a good bit of time taken up by Xcode starting up. However, be prepared for massive amounts of console output!