security/zeek: fix build on non aarch64 / amd64 / armv? / i386

1. Enable SPICY only on aarch64 / amd64 / armv? / i386 as specified in
https://github.com/zeek/spicy/blob/d0bc60537b53c3a951a0bdcb7b1c080bbb068abf/hilti/runtime/src/fiber.cc#L252
2. Correct a parameter passed to CMake to disable Spicy.
3. Correct pkg-plist for build with disabled Spicy.

Approved by:	portmgr (blanket)