Log Message:
-----------
Fix 'make clean' for change of regression.diffs file name.
Modified Files:
--------------
pgsql/src/interfaces/ecpg/test:
Makefile (r1.56 -> r1.57)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/Makefile.diff?r1=1.56&r2=1.57)