pgsql: Don't overwrite EXTRA_INSTALL

Don't overwrite EXTRA_INSTALL

The temp-install target sets EXTRA_INSTALL to install the current
directory. But when doing so, it should append instead of overwrite,
otherwise settings of EXTRA_INSTALL from a makefile won't take effect.
This would cause the earthdistance test to fail when called directly,
because it would miss installing the cube module.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/ee8d392765f29b1b8adb52f75008e301823f094b

Modified Files
--------------
src/makefiles/pgxs.mk | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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