Changes to get Win32 compiling again, including substituting
  apr_string.h for apr_lib.h, fix some bad linkage declarations,
  and some more comments on threadproc/win32/proc.c


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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85876 13f79535-47bb-0310-9956-ffa450edef68