* win32/configure.bat: added help message of --with(out)?-ext.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36794 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

win32/configure.bat

@@ -172,6 +172,8 @@ goto :loop
   echo Optional Package:
   echo   --with-baseruby=RUBY    use RUBY as baseruby [ruby]
   echo   --with-static-linked-ext link external modules statically
+  echo   --with-ext="a,b,..."    use extensions a, b, ...
+  echo   --without-ext="a,b,..." ignore extensions a, b, ...
   echo   --disable-install-doc   do not install rdoc indexes during install
   echo   --disable-win95         disable win95 support
   echo   --with-ntver=0xXXXX     target NT version (shouldn't use with old SDK)