Repost: FastFPE results for Linux/ARM

On Linux/ARM PostgreSQL may encounter 2 types of floating point emulation:
  1) standard precision: Linux/NWFPE, GCC soft-float
  2) reduced precision: Linux/FastFPE

Currently pg_regress allows only unconditional alternatives - thus
different results are accepted on all platforms.  This should be
avoided as acceptable behaviour on one platform may be bug on another.

Following patch:

* Lets pg_regress.sh accept multiple values from resultmap
* Adds FastFPE results for 'point' test

--
marko