pgsql: Miscellaneous cleanup to silence compiler warnings seen on Mingw

Miscellaneous cleanup to silence compiler warnings seen on Mingw.

Remove some dead code, conditionally declare some items or call
some code, and fix one or two declarations.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/0f44335122fd01b54417bc955d6a98b967ca832c

Modified Files
--------------
src/backend/executor/nodeBitmapHeapscan.c | 4 ++++
src/backend/utils/adt/formatting.c | 12 ++++++++++++
src/backend/utils/adt/varlena.c | 4 ++++
src/bin/initdb/initdb.c | 23 -----------------------
src/bin/pg_basebackup/pg_basebackup.c | 11 ++++++++---
src/bin/pg_basebackup/pg_receivexlog.c | 4 ++++
src/bin/pg_ctl/pg_ctl.c | 7 -------
src/bin/pgevent/pgevent.c | 1 -
src/interfaces/ecpg/pgtypeslib/timestamp.c | 6 +++---
9 files changed, 35 insertions(+), 37 deletions(-)