pgsql: Split builtins.h to a new header ruleutils.h

Split builtins.h to a new header ruleutils.h

The new header contains many prototypes for functions in ruleutils.c
that are not exposed to the SQL level.

Reviewed by Andres Freund and Michael Paquier.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/7b1c2a0f2066672b24f6257ec9b8d78a1754f494

Modified Files
--------------
src/backend/access/index/genam.c  |    1 +
src/backend/catalog/heap.c        |    1 +
src/backend/commands/explain.c    |    1 +
src/backend/commands/tablecmds.c  |    1 +
src/backend/commands/typecmds.c   |    1 +
src/backend/utils/adt/misc.c      |    1 +
src/backend/utils/adt/ruleutils.c |    1 +
src/include/utils/builtins.h      |   11 -----------
src/include/utils/ruleutils.h     |   34 ++++++++++++++++++++++++++++++++++
9 files changed, 41 insertions(+), 11 deletions(-)