[PATCH] Allow CMake to build Sphinx documentation

[Daniel Liew]

Hi,

Attached is a patch (0001) that enables the Sphinx documentation to be
built when using the CMake build system when LLVM_ENABLE_SPHINX is
enabled (disabled by default).

I've added quite a few sphinx build targets based on what is in
docs/Makefile.sphinx but not all because they are more complicated.
The only sphinx build target enabled by default when
LLVM_ENABLE_SPHINX is enabled is "sphinx-llvm-html". I'm not sure if
sphinx-llvm-json or sphinx-llvm-pickle is actually useful.

It would be nice to enable sphinx-llvm-linkcheck by default (when
LLVM_ENABLE_SPHINX is enabled) so people could be made aware of broken
links in the documentation but there are already quite a few broken
links and I don't want to break any builds that might decide to use
LLVM_ENABLE_SPHINX and LLVM_BUILD_DOCS for now.

I've tested this on Linux with sphinx 1.2.2 with make and Ninja.

Please review.

Thanks,
Dan.
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