pgsql: Mark some more variables as static or include the appropriate he

Mark some more variables as static or include the appropriate header

Detected by clang's -Wmissing-variable-declarations.

From: Andres Freund <andres@anarazel.de>

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/66c04c981dfe7c1d1e633dddcecf01982d0bde65

Modified Files
--------------
src/backend/commands/event_trigger.c |    2 +-
src/backend/postmaster/bgworker.c    |    2 +-
src/backend/postmaster/postmaster.c  |    3 +--
src/backend/storage/lmgr/s_lock.c    |    1 +
src/backend/utils/init/globals.c     |    1 +
src/bin/initdb/initdb.c              |    2 +-
src/include/storage/pg_shmem.h       |    2 +-
src/interfaces/ecpg/preproc/pgc.l    |    2 +-
8 files changed, 8 insertions(+), 7 deletions(-)