Fix bogus handling of $(X) (i.e., ".exe") in isolationtester Makefile.

I'm not sure why commit 1eb1dde049ccfffc42c80c2bcec14155c58bcc1f seems
to have made this start to fail on Cygwin when it never did before ---
but nonetheless, the coding was pretty bogus, and unlike the way we
handle $(X) anywhere else.  Per buildfarm.

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/2f5390aacc7b7ff297dcfeaeab40dae8bb3943c9

Modified Files
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src/test/isolation/Makefile |   14 ++++++--------
1 files changed, 6 insertions(+), 8 deletions(-)

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Next:	From: Peter Eisentraut	Date: 2012-11-02 02:58:51
	Subject: pgsql: Fix typo
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	Subject: pgsql: Limit the number of rel sets considered inconsider_index_join_o