Auto-detect the path to the JDK on Windows.
Auto-detect the path to the JDK on Windows.

* build/generator/gen_win.py
  (WinGeneratorBase._find_jdk): Determine the path to the JDK by looking at
   its registry entries.
  (WinGeneratorBase.__init__): Call self._find_jdk().
  (get_proj_sources): Prepend the path to the JDK's bin/ directory to the Java
   tools (javah, javac and jar).
  (get_win_includes): For the "libsvnjavahl" target, add the JDK's include/
   and include/win32/ subdirectories to the list of include directories.

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