Try to un-break MSVC build.
Try to un-break MSVC build.

I thought we had enough infrastructure to absorb CPPFLAGS changes from
the makefiles, but buildfarm says otherwise.

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