New in 2.10:
* Support for Linux/S390.
<sigsegv.h> now defines a macro SIGSEGV_FAULT_ADDRESS_ALIGNMENT.
It is either 1 or pagesize. Its meaning is that
- The fault address passed to a SIGSEGV handler has been rounded down
to a multiple of SIGSEGV_FAULT_ADDRESS_ALIGNMENT.
- The address and length arguments of sigsegv_register function calls
must be multiples of SIGSEGV_FAULT_ADDRESS_ALIGNMENT.
* Faster distinction between stack overflow and other fault on OpenBSD.
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