[Bug #759] Logger::ProgName should be svn-friendly

Bug #759: Logger::ProgName should be svn-friendly
http://redmine.ruby-lang.org/issues/show/759

e$B5/I<<Te(B: Nobuhiro IMAI
e$B%9%F!<%?%9e(B: Open, e$BM%@hEYe(B: Normal
e$B%+%F%4%je(B: lib

logger.rb e$B$,%m%0%U%!%$%k$N@hF,$KIU$1$k%X%C%@$G$9$,!“e(B
CVS e$B$N$3$m$NL>;D$j$G!”%W%m%0%i%`L>$,e(B /
e$B$K$J$C$F$$$k$h$&$G$9!#e(B
e$B$$$D$^$Ge(B Subversion e$B$rMxMQ$9$k$+$ODj$+$G$O$"$j$^$;$s$,!“e(B
e$B$H$j$”$($:%F%9%H$b=q$$$F$_$^$7$?!#e(B

e$B%A%1%C%He(B #759 e$B$,99?7$5$l$^$7$?!#e(B (by Nobuyoshi N.)

e$B%9%F!<%?%9e(B Opene$B$+$ie(BClosede$B$KJQ99e(B
e$B?JD=e(B % 0e$B$+$ie(B100e$B$KJQ99e(B

Applied in changeset r20245.

http://redmine.ruby-lang.org/issues/show/759