Log Message:
libsigsegv: update to 2.13.

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.