Represent 'unit' as C 'int'; change pattern match compilation to avoid 'goto'; change Postgres prepared statement compilation to make life easier for the GCC escape analysis; all this in support of better tail call optimization

ffi test
include test.h
script http://localhost/test/test.js
link test.o
effectful Test.print
serverOnly Test.foo
clientOnly Test.bar
effectful Test.transactional
jsFunc Test.print=print
jsFunc Test.bar=bar