Replace /GX compile flag which was always an alias of /EHsc
  (/GX is deprecated).  Drop /machine link flag which was always
  implicit, and MS has moved from different /machine flags twords
  using alternate linker binaries.  (And of course, link is a bit
  late to choose machine architecture anyways, if the user hadn't
  used the correct compile flags.)

Backports: 395419, 397407

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@419202 13f79535-47bb-0310-9956-ffa450edef68