pgsql: Revert haphazard pgxs makefile changes

Revert haphazard pgxs makefile changes

These changes were originally submitted as "adds support for VPATH with
USE_PGXS", but they are not necessary for VPATH support, so they just
add more lines of code for no reason.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/e4b5a070b4d25da2c2f80af306fa1d19044370ae

Modified Files
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src/makefiles/pgxs.mk | 43 ++++++++++++++++++-------------------------
1 file changed, 18 insertions(+), 25 deletions(-)

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