On Windows: stop linking against a system DLL that is not used by most
processes, to avoid a slight performance penalty on loading libsvn_subr
that is only needed for 'svn --version --verbose'.

As this dll is usually not loaded and not needed except for debugging,
we don't want to pay the system (and especially virusscanner) overhead
of always loading this dll.

* build.conf
  (libsvn_subr): Remove psapi.lib.

* subversion/libsvn_subr/sysinfo.c
  (FNENUMPROCESSMODULES): Fix definition to match system header.
  (enum_loaded_modules): Obtain EnumProcessModules dynamically.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1534102 13f79535-47bb-0310-9956-ffa450edef68