pgsql: Make SyncRepWakeQueue to a static function

Make SyncRepWakeQueue to a static function

It is only used in src/backend/replication/syncrep.c.

Back-patch to all supported branches except 9.1 which declares the
function as static.

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/3740bb8347a946232ad281174398a825c1b40c73

Modified Files
--------------
src/backend/replication/syncrep.c | 3 ++-
src/include/replication/syncrep.h | 3 ---
2 files changed, 2 insertions(+), 4 deletions(-)

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