pgsql: AIX: Link TRANSFORM modules with their dependencies.

AIX: Link TRANSFORM modules with their dependencies.

The result closely resembles linking of these modules for the "win32"
port.  Augment the $(exports_file) header so the file is also usable as
an import file.  Unfortunately, relocating an AIX installation will now
require adding $(pkglibdir) to LD_LIBRARY_PATH.  Back-patch to 9.5,
where the modules were introduced.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/7193436744819270eeb772f6ada4ec7a388c0b5f

Modified Files
--------------
contrib/hstore_plperl/Makefile   |    7 ++++++-
contrib/hstore_plpython/Makefile |    7 ++++++-
contrib/ltree_plpython/Makefile  |    7 ++++++-
src/Makefile.shlib               |    3 ++-
4 files changed, 20 insertions(+), 4 deletions(-)