[patch] Rename CLANG_IS_PRODUCTION to CLANG_NO_PLUGIN_SUPPORT

[Rafael Espíndola]

The clang build has a CLANG_IS_PRODUCTION option. Historically this
would disable features that were not ready yet (c++ for example). It
would also disable plugins, which is an expensive feature for some
setups.

Currently the option is only used to disable plugins, so the attached
patch renames it to CLANG_NO_PLUGIN_SUPPORT.

On the Makefile build it also enables dead stripping in plugins are
disabled. It looks like it was an oversight when dead stripping
support was added.

Cheers,
Rafael
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