* asan: try to fix st_memory_leak for asan check
* asan: srs_st_unit should be call in hybrid server stop
* Rename st_uninit to st_destroy. v5.0.91
Co-authored-by: winlin <winlin@vip.126.com>
1. Support cygwin by '--cygwin64=on'
2. Detect cygwin automatically.
3. Disalbe sanitizer, srt and srtp with openssl.
4. Disable multiple threads, use single threads.
5. Support utest for cygwin64.
6. Query features for windows by API.
7. Disable stat APIs for cygwin.
8. Use ST select event driver.
Co-authored-by: wenjie.zhao <740936897@qq.com>