Use "stack_t" instead of "struct sigaltstack", as the former is the
newer standardized name. NFC.

Use 'curlwp' here insteald of the 'l' - which isn't passsed as an arg
to the #define, but will always be curlwp.

Modify the (recently added) compat_sigaltstack() #define to take the
values of the SS_ONSTACK and SS_DISABLE constants.
Use it to shorten the source files when this action is replicated.
Actually, gi

Modify the (recently added) compat_sigaltstack() #define to take the
values of the SS_ONSTACK and SS_DISABLE constants.
Use it to shorten the source files when this action is replicated.
Actually, given the monstrous complexity of sigaltstack1() there is
probably a much better way to do this...

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Add a #define that expands to the compat wrapper for sigaltstack1().
Use it for the netbsd32_compat_13.c version of the code.