pgsql: Add strlcpy() to the set of functions supported by src/port/ when

Log Message:
-----------
Add strlcpy() to the set of functions supported by src/port/ when not
available directly on the platform. Per discussion, this function is
sufficiently widely recognized to be treated as standard.

Modified Files:
--------------
pgsql:
configure (r1.505 -> r1.506)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.diff?r1=1.505&r2=1.506)
configure.in (r1.475 -> r1.476)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.in.diff?r1=1.475&r2=1.476)
pgsql/src/include:
pg_config.h.in (r1.100 -> r1.101)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/pg_config.h.in.diff?r1=1.100&r2=1.101)
port.h (r1.99 -> r1.100)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/port.h.diff?r1=1.99&r2=1.100)

Added Files:
-----------
pgsql/src/port:
strlcpy.c (r1.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/port/strlcpy.c?rev=1.1&content-type=text/x-cvsweb-markup)