pgsql: Partial fix for ecpg's VPATH problems.

Log Message:
-----------
Partial fix for ecpg's VPATH problems.  It compiles and successfully
builds all the files needed for its regression tests, but the tests
themselves fail because of diffs in the #line directives output by
ecpg itself.  Not sure what to do about that.

Modified Files:
--------------
    pgsql/src/interfaces/ecpg/compatlib:
        Makefile (r1.23 -> r1.24)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/compatlib/Makefile.diff?r1=1.23&r2=1.24)
    pgsql/src/interfaces/ecpg/ecpglib:
        Makefile (r1.40 -> r1.41)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/Makefile.diff?r1=1.40&r2=1.41)
    pgsql/src/interfaces/ecpg/include:
        Makefile (r1.27 -> r1.28)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/include/Makefile.diff?r1=1.27&r2=1.28)
    pgsql/src/interfaces/ecpg/pgtypeslib:
        Makefile (r1.29 -> r1.30)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/pgtypeslib/Makefile.diff?r1=1.29&r2=1.30)
    pgsql/src/interfaces/ecpg/preproc:
        Makefile (r1.120 -> r1.121)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/Makefile.diff?r1=1.120&r2=1.121)
    pgsql/src/interfaces/ecpg/test:
        Makefile (r1.58 -> r1.59)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/Makefile.diff?r1=1.58&r2=1.59)
        Makefile.regress (r1.3 -> r1.4)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/Makefile.regress.diff?r1=1.3&r2=1.4)
        pg_regress.sh (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/pg_regress.sh.diff?r1=1.6&r2=1.7)

Removed Files:
-------------
    pgsql/src/interfaces/ecpg/test:
        pg_regress.inc.sh.in
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/pg_regress.inc.sh.in)