Fixed link error with VC14.

* win32/mkexports.rb (Exports::Mswin#each_exports): should ignore `vsprintf_s_l`
  and the like just like `vsprintf_l`.
  [ruby-dev:49899] [Bug #13033]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57079 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

win32/mkexports.rb

@@ -114,7 +114,7 @@ class Exports::Mswin < Exports
         when /OBJECT/, /LIBRARY/
           next if /^[[:xdigit:]]+ 0+ UNDEF / =~ l
           next unless /External/ =~ l
-          next if /(?:_local_stdio_printf_options|v(f|sn?)printf_l)\Z/ =~ l
+          next if /(?:_local_stdio_printf_options|v(f|sn?)printf(_s)?_l)\Z/ =~ l
           next unless l.sub!(/.*?\s(\(\)\s+)?External\s+\|\s+/, '')
           is_data = !$1
           if noprefix or /^[@_]/ =~ l