C comments: remove odd blank lines after #ifdef WIN32 lines

src/backend/access/transam/xlog.c

src/backend/libpq/pqcomm.c

src/backend/main/main.c

src/backend/postmaster/postmaster.c

src/backend/storage/file/fd.c

src/backend/utils/adt/pg_locale.c

src/backend/utils/adt/selfuncs.c

src/backend/utils/error/elog.c

src/bin/initdb/initdb.c

src/interfaces/libpq/fe-connect.c

src/pl/plperl/plperl.c

src/port/getaddrinfo.c

src/port/getrusage.c

src/port/path.c

src/port/sprompt.c

src/test/regress/pg_regress.c

src/timezone/zic.c