New in 2.13:
* Added support for macOS/arm64.
* Added support for Solaris OpenIndiana.
* Added support for catching stack overflow on Solaris 11/SPARC.
* Added support for catching stack overflow on 64-bit Haiku.
* Provide a correct value for SIGSTKSZ on 64-bit Solaris/x86. The one defined
by this system is too small.
* Improved support for Linux/RISC-V, Linux/nds32.
* Improved support for Android.
* Improved support for FreeBSD/x86, FreeBSD/x86_64, FreeBSD/arm, FreeBSD/arm64.
* Improved support for 64-bit ABI on Solaris/x86_64.
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