pgsql: Fix python_includespec on Windows at configure time

Fix python_includespec on Windows at configure time

By converting to using forward slashes at configure time we avoid
having to repeat the logic anywhere that this is needed, such as
in transforms modules for plpython.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/b6b2149e48aa61981ae0199c963d5145a37c258c

Modified Files
--------------
config/python.m4 | 3 +++
configure | 3 +++
src/pl/plpython/Makefile | 6 ++----
3 files changed, 8 insertions(+), 4 deletions(-)

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