pgsql: Support cross compilation by compiling "zic" with a native

Log Message:
-----------
Support cross compilation by compiling "zic" with a native compiler. This
relies on the output of zic being platform independent, but that is
currently the case.

Modified Files:
--------------
pgsql:
configure (r1.441 -> r1.442)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.diff?r1=1.441&r2=1.442)
configure.in (r1.414 -> r1.415)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/configure.in.diff?r1=1.414&r2=1.415)
pgsql/doc/src/sgml:
installation.sgml (r1.238 -> r1.239)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/installation.sgml.diff?r1=1.238&r2=1.239)
pgsql/src:
Makefile.global.in (r1.214 -> r1.215)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/Makefile.global.in.diff?r1=1.214&r2=1.215)
pgsql/src/timezone:
Makefile (r1.17 -> r1.18)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/Makefile.diff?r1=1.17&r2=1.18)