pgsql-server: Set DYLD_LIBRARY_PATH so that 'make check' works without

Log Message:
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Set DYLD_LIBRARY_PATH so that 'make check' works without prior
'make install' on OS X. Per suggestion from Adam Witney.

Modified Files:
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pgsql-server/src/test/regress:
pg_regress.sh (r1.45 -> r1.46)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/test/regress/pg_regress.sh.diff?r1=1.45&r2=1.46)