Log Message:
Update to libsigsegv 2.10

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.