* ext/extmk.rb.in (have_library): do not print yes. sigh.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@1947 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/extmk.rb.in

@@ -196,10 +196,7 @@ def have_library(lib, func="main")
   if func && func != ""
     libs = append_library($libs, lib)
     if /mswin32|mingw/ =~ RUBY_PLATFORM
-      if lib == 'm'
-	print "yes\n"
-	return true
-      end
+      return true if lib == 'm'
       r = try_link(<<"SRC", libs)
 #include <windows.h>
 #include <winsock.h>