c2f964a674 tests: Remove Cygwin WinMain workaround (practicalswift)
db4bd32cc3 tests: Skip unnecessary fuzzer initialisation. Hold ECCVerifyHandle only when needed. (practicalswift)
Pull request description:
Skip unnecessary fuzzer initialisation. Hold `ECCVerifyHandle` only when needed.
As suggested by MarcoFalke in https://github.com/bitcoin/bitcoin/pull/17018#discussion_r336645391.
Top commit has no ACKs.
Tree-SHA512: 598da44859d736e3fdc143b93e07f444d8ad19dfdab0cfe7c6ccff8644e862664d869337dfe6b49416ed09a0024e4a5f2220ca6246de568f9e9227d721baa28e