Re: [bug fix] pg_ctl always uses the same event source

From: "Amit Kapila" 
Only one minor suggestion:
+        Name of the event source for pg_ctl to use for event log.  The
+        default is PostgreSQL.

>From this description, it is not clear when the event log will be used
in pg_ctl.  For example, if user uses -e option with register, then he
might expect any failure during register command will be logged into
eventlog, but that is not true.  So I think we should improve the docs
to reflect the usage of -e.

On Linux, I am getting below build failure for pg_ctl

pg_ctl.c: In function ‘main’:
pg_ctl.c:2173: error: ‘event_source’ undeclared (first use in this 
function)
pg_ctl.c:2173: error: (Each undeclared identifier is reported only once
pg_ctl.c:2173: error: for each function it appears in.)
make[3]: *** [pg_ctl.o] Error 1
make[2]: *** [all-pg_ctl-recurse] Error 2
make[1]: *** [all-bin-recurse] Error 2
make: *** [all-src-recurse] Error 2


Thank you for reviewing and testing.  I changed the doc, but I'd appreciate 
it if you could improve my poor English and update the CommitFest if it can 
be better.

I rebased the patch to HEAD and removed the compilation error on Linux.  I 
made event_source variable on all platforms like register_servicename, 
although they are not necessary on non-Windows platforms.

Regards
MauMau