Install compiled functions into $(LIBDIR)/contrib.
(Thanks to Brook Milligan <brook@trillium.NMSU.Edu>)

Leave all other input values to return FALSE.
In next version, do more checking for valid inputs for both TRUE and FALSE.

Allows the following example:
  select 'first string'
  '---'
  'last string';
 to be output as 'first string---last string'.

 Wrong function referenced in previous versions.

RelationIdCacheGetRelation() to flush relations from cache
in commit time.

 to use bool as the type for arguments and return values.

 rather than just 't' and 'T'.  This allows yes/no and 1/0
 to be interpreted as one might expect.
Clean up function declarations to use bool as the type for arguments
 and return values.

lconv is already taken as a struct identifier defined in a /usr/include file.
Only has an effect with USE_LOCALE enabled.
(Apparently unique to AIX and/or AIX compiler? thomas)