pgsql: Make ECPG test programs depend on "ecpg$(X)", not "ecpg".

Make ECPG test programs depend on "ecpg$(X)", not "ecpg".

Cygwin builds require this of dependencies pertaining to pattern rules.
On Cygwin, stat("foo") in the absence of a file with that exact name can
locate foo.exe. While GNU make uses stat() for dependencies of ordinary
rules, it uses readdir() to assess dependencies of pattern rules.
Therefore, a pattern rule dependency should match any underlying file
name exactly. Back-patch to 9.4, where the dependency was introduced.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/67a412049489f554c3a552bd523cefd30d038221

Modified Files
--------------
src/interfaces/ecpg/test/Makefile.regress | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)