pgsql: Move set_pglocale_pgservice() from path.c to exec.c, so that

Log Message:
-----------
Move set_pglocale_pgservice() from path.c to exec.c, so that pulling in
path.c does not in itself force linking of both exec.c and libintl.
Should fix current ecpglib build failure on pickier platforms.

Modified Files:
--------------
pgsql/src/include:
port.h (r1.97 -> r1.98)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/port.h.diff?r1=1.97&r2=1.98)
pgsql/src/interfaces/ecpg/ecpglib:
Makefile (r1.42 -> r1.43)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/ecpglib/Makefile.diff?r1=1.42&r2=1.43)
pgsql/src/port:
exec.c (r1.42 -> r1.43)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/port/exec.c.diff?r1=1.42&r2=1.43)
path.c (r1.66 -> r1.67)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/port/path.c.diff?r1=1.66&r2=1.67)