pgsql: Catch all errors in for and while loops in makefiles.

Log Message:
-----------
Catch all errors in for and while loops in makefiles. Don't ignore any
errors in any commands, including in various clean targets that have so far
been handled inconsistently. make -i is available to ignore all errors in
a consistent and official way.

Modified Files:
--------------
pgsql:
GNUmakefile.in (r1.46 -> r1.47)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/GNUmakefile.in?r1=1.46&r2=1.47)
pgsql/doc:
Makefile (r1.30 -> r1.31)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/Makefile?r1=1.30&r2=1.31)
pgsql/src:
Makefile (r1.42 -> r1.43)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/Makefile?r1=1.42&r2=1.43)
pgsql/src/backend/snowball:
Makefile (r1.4 -> r1.5)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/snowball/Makefile?r1=1.4&r2=1.5)
pgsql/src/backend/utils/mb/conversion_procs:
Makefile (r1.18 -> r1.19)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/Makefile?r1=1.18&r2=1.19)
pgsql/src/bin:
Makefile (r1.51 -> r1.52)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/Makefile?r1=1.51&r2=1.52)
pgsql/src/interfaces:
Makefile (r1.55 -> r1.56)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/Makefile?r1=1.55&r2=1.56)
pgsql/src/interfaces/ecpg:
Makefile (r1.22 -> r1.23)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/Makefile?r1=1.22&r2=1.23)
pgsql/src/pl:
Makefile (r1.26 -> r1.27)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/Makefile?r1=1.26&r2=1.27)
pgsql/src/pl/plpgsql:
Makefile (r1.8 -> r1.9)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/Makefile?r1=1.8&r2=1.9)
pgsql/src/test/bench:
Makefile (r1.15 -> r1.16)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/bench/Makefile?r1=1.15&r2=1.16)
pgsql/src/test/locale:
Makefile (r1.9 -> r1.10)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/locale/Makefile?r1=1.9&r2=1.10)
pgsql/src/test/locale/de_DE.ISO8859-1:
Makefile (r1.1 -> r1.2)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/locale/de_DE.ISO8859-1/Makefile?r1=1.1&r2=1.2)
pgsql/src/test/locale/gr_GR.ISO8859-7:
Makefile (r1.1 -> r1.2)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/locale/gr_GR.ISO8859-7/Makefile?r1=1.1&r2=1.2)
pgsql/src/test/locale/koi8-r:
Makefile (r1.1 -> r1.2)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/locale/koi8-r/Makefile?r1=1.1&r2=1.2)
pgsql/src/test/locale/koi8-to-win1251:
Makefile (r1.1 -> r1.2)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/locale/koi8-to-win1251/Makefile?r1=1.1&r2=1.2)
pgsql/src/test/regress:
GNUmakefile (r1.71 -> r1.72)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/GNUmakefile?r1=1.71&r2=1.72)