Provide a complete set of file-permission-bit macros in win32.h.
Provide a complete set of file-permission-bit macros in win32.h.

My previous patch exposed the fact that we didn't have these.  Those
hard-wired octal constants were actually wrong on Windows, not just
inconsistent.

kmjungersen/PostgresXL,xinzweb/gpdb,ashwinstar/gpdb,postmind-net/postgres-xl,tpostgres-projects/tPostgres,pavanvd/postgres-xl,Postgres-XL/Postgres-XL,xinzweb/gpdb,Postgres-XL/Postgres-XL,yazun/postgres-xl,ashwinstar/gpdb,jmcatamney/gpdb,lisakowen/gpdb,yazun/postgres-xl,ashwinstar/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,Postgres-XL/Postgres-XL,lisakowen/gpdb,50wu/gpdb,ashwinstar/gpdb,lisakowen/gpdb,lisakowen/gpdb,50wu/gpdb,adam8157/gpdb,snaga/postgres-xl,xinzweb/gpdb,50wu/gpdb,pavanvd/postgres-xl,xinzweb/gpdb,postmind-net/postgres-xl,jmcatamney/gpdb,adam8157/gpdb,oberstet/postgres-xl,techdragon/Postgres-XL,ashwinstar/gpdb,adam8157/gpdb,techdragon/Postgres-XL,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,ovr/postgres-xl,50wu/gpdb,zeroae/postgres-xl,zeroae/postgres-xl,snaga/postgres-xl,kmjungersen/PostgresXL,lisakowen/gpdb,tpostgres-projects/tPostgres,tpostgres-projects/tPostgres,xinzweb/gpdb,arcivanov/postgres-xl,lisakowen/gpdb,ovr/postgres-xl,lisakowen/gpdb,adam8157/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,adam8157/gpdb,greenplum-db/gpdb,50wu/gpdb,adam8157/gpdb,tpostgres-projects/tPostgres,snaga/postgres-xl,xinzweb/gpdb,xinzweb/gpdb,lisakowen/gpdb,snaga/postgres-xl,greenplum-db/gpdb,ovr/postgres-xl,pavanvd/postgres-xl,techdragon/Postgres-XL,jmcatamney/gpdb,arcivanov/postgres-xl,postmind-net/postgres-xl,pavanvd/postgres-xl,adam8157/gpdb,arcivanov/postgres-xl,ovr/postgres-xl,yazun/postgres-xl,postmind-net/postgres-xl,pavanvd/postgres-xl,ashwinstar/gpdb,50wu/gpdb,50wu/gpdb,adam8157/gpdb,postmind-net/postgres-xl,tpostgres-projects/tPostgres,kmjungersen/PostgresXL,50wu/gpdb,greenplum-db/gpdb,arcivanov/postgres-xl,ovr/postgres-xl,Postgres-XL/Postgres-XL,techdragon/Postgres-XL,kmjungersen/PostgresXL,xinzweb/gpdb,arcivanov/postgres-xl,kmjungersen/PostgresXL,oberstet/postgres-xl,jmcatamney/gpdb,snaga/postgres-xl,zeroae/postgres-xl,greenplum-db/gpdb,oberstet/postgres-xl,jmcatamney/gpdb,zeroae/postgres-xl,greenplum-db/gpdb,jmcatamney/gpdb,arcivanov/postgres-xl,yazun/postgres-xl,oberstet/postgres-xl,oberstet/postgres-xl,yazun/postgres-xl,greenplum-db/gpdb,jmcatamney/gpdb,zeroae/postgres-xl