- Update to (lib)fcall-2.2 release
* Added support for the following platforms:
(Previously, a build on these platforms failed.)
- armv6 (Raspberry Pi): Linux.
- hppa: Linux 32-bit.
- riscv32: Linux with ilp32d ABI.
- riscv64: Linux with lp64d ABI.
* The build for the mips 32-bit ABI is now compatible with toolchains for
the 'fpxx' ABI variant. The downside is that the mips1 architecture is
no longer supported.
* Fixed a bug regarding passing of more than 8 arguments on the following
platforms:
- arm64: Linux 64-bit.
* Fixed a stack corruption bug on the following platforms:
- hppa: HP-UX 32-bit.

- add upstream signing keyring and verify source signature