* Correct cmake script to support Open Watcom toolchain (#8167)
* Fix thread start callback prototype for Open Watcom toolchain (#8175)
* Added GitHub CI action for Windows/Linux/OS2
* Improvements for C89 compliance.
Thank you @jmalak for your contributions.
* added POSIX definitions for XFEOF(), XFERROR(), and XCLEARERR(), currently with no-op fallbacks for !POSIX.
* added missing file handle checks in testsuite/testsuite.c:file_test() and tests/utils.h:copy_file().
* added fixes and suppression around tests/api.c:test_wolfSSL_SMIME_read_PKCS7().
* added various fixes in examples/asn1/asn1.c and examples/pem/pem.c.
1. For Mach and FreeBsd builds, add the function link_file() which makes
a hard link for a file.
2. Add a macro STAGE_FILE that either calls copy_file or link_file
depending on doing a Mach or FreeBSD build or not.
This is to work around how the CRL Monitor is detecting file changes
made by the CRL monitor test in the testsuite. Linux and Windows are
detecting the file copies and deletes, and how macOS detects them.
kevent sees the link as a single change to the parent directory and
reads it. When you copy the file, kevent sees the new file getting
opened and triggering the file update.
