build: Improve build by cmake for Cygwin (#2085)

- Fix build on Cygwin.
- Simplify file name of static library.

Co-authored-by: Jameson Nash <vtjnash@gmail.com>

build: add libuv-static pkg-config file

Fixes: https://github.com/libuv/libuv/issues/2988
PR-URL: https://github.com/libuv/libuv/pull/2993
Reviewed-By: Ben Noordhuis <info@bnoordhuis

build: add libuv-static pkg-config file

Fixes: https://github.com/libuv/libuv/issues/2988
PR-URL: https://github.com/libuv/libuv/pull/2993
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

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