Backpatch pgxs vpath build and installation fixes.
This is a backpatch of commits d942f9d9, 82b01026, and 6697aa2bc, back
to release 9.1 where we introduced extensions which make heavy use of
the PGXS infrastructure.
Branch
------
REL9_1_STABLE
Details
-------
http://git.postgresql.org/pg/commitdiff/15892461042f4e00322f4116236697dde022a2f8
Modified Files
--------------
src/Makefile.global.in | 12 ++++++++++-
src/makefiles/pgxs.mk | 56 ++++++++++++++++++++++++++++++++----------------
2 files changed, 49 insertions(+), 19 deletions(-)