Windows: Set 3rdparty libraries to link to CRT dynamically.
Windows: Set 3rdparty libraries to link to CRT dynamically.

This also fixes a bug where the `libevent` build on Windows would add
`''` to the compiler flags, which is an unrecognized flag, and sets
the names of our `CMAKE_FORWARD_ARGS` variables consistently (some
were missing the `FORWARD` part).

Review: https://reviews.apache.org/r/66011

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