1. Support github actions on Windows Server 2022.
2. Use cygwin64 in windows-latest to build SRS.
3. Package SRS-xxx-setup.exe by NSIS.exe
4. Patch crypto/include/config.h for libsrtp.
5. Support run as administrator.
6. Apply utest for cygwin.
7. Enable srtp over openssl.
1. Replase ln by cp for windows.
2. Refine OS and CPU arch detecting.
3. Support configure from any directory by `SRS_WORKDIR`.
4. Support output to any directory by `SRS_OUTPUT`.
5. Disable sanitizer for gperf.
6. Use parallels build for make.
7. Refine bash variable check.