Fix compile warning. The /wd:XXXX is invalid. It should

be /wdXXXX, and since its for VS2005 only use the standard
preprocessor directives instead of that.
This should be backported to 2.2 as well.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@463929 13f79535-47bb-0310-9956-ffa450edef68