pgsql-server: Avoid including <sys/time.h> on platforms that don't have

Log Message:
-----------
Avoid including <sys/time.h> on platforms that don't have it.
Per trouble report from Andreas Pflug.

Modified Files:
--------------
pgsql-server:
configure (r1.375 -> r1.376)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/configure.diff?r1=1.375&amp;r2=1.376)
configure.in (r1.364 -> r1.365)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/configure.in.diff?r1=1.364&amp;r2=1.365)
pgsql-server/src/include/libpq:
libpq-be.h (r1.45 -> r1.46)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/libpq/libpq-be.h.diff?r1=1.45&amp;r2=1.46)
pgsql-server/src/include:
pg_config.h.in (r1.77 -> r1.78)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/include/pg_config.h.in.diff?r1=1.77&amp;r2=1.78)