pgsql: Remove embedded newline in string literal --- seems to make newer

Log Message:
-----------
Remove embedded newline in string literal --- seems to make newer gcc
versions very unhappy, and shouldn't be there anyway.

Modified Files:
--------------
pgsql/src/backend/utils/misc:
guc.c (r1.324 -> r1.325)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/guc.c.diff?r1=1.324&r2=1.325)