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

local
  $(SML_LIB)/basis/basis.mlb
  $(SML_LIB)/smlnj-lib/Util/smlnj-lib.mlb
  $(SML_LIB)/mlyacc-lib/mlyacc-lib.mlb
  $(SML_LIB)/smlnj-lib/PP/pp-lib.mlb
in