Remove sys/types.h in files that include postgres.h, and hence c.h,

src/backend/access/transam/clog.c

src/backend/access/transam/xlog.c

src/backend/commands/async.c

src/backend/commands/dbcommands.c

src/backend/commands/user.c

src/backend/executor/execScan.c

src/backend/executor/nodeHash.c

src/backend/executor/nodeHashjoin.c

src/backend/lib/lispsort.c

src/backend/libpq/auth.c

src/backend/libpq/be-fsstubs.c

src/backend/libpq/be-secure.c

src/backend/libpq/hba.c

src/backend/libpq/pqcomm.c

src/backend/nodes/nodeFuncs.c

src/backend/optimizer/path/joinpath.c

src/backend/optimizer/plan/createplan.c

src/backend/optimizer/plan/initsplan.c

src/backend/optimizer/plan/planmain.c

src/backend/optimizer/plan/setrefs.c