build: add a cmake build file

All good things come in threes and that's why besides autotools and gyp,
you can now also build everyone's favorite platform abstraction library
with cmake.

This is Ouroboros eating its own tail in a way because cmake depends on
libuv, depends on cmake, depends on libuv, depends on... inception!

Things it does:

* build the shared library
* build the static library
* install the shared library
* install the static library
* install the header files
* install libuv.pc

Things it does not yet do:

* build or install the documentation
* build or execute the test suite
* produce a release tarball
* provide auto-config for downstream cmake-based projects

Fixes: https://github.com/libuv/libuv/issues/1362
PR-URL: https://github.com/libuv/libuv/pull/1850
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

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