fixed win32 CI and nightly builds (refs #5)

* The libtool wrapper binaries do not pass down UTF-8 strings correctly,
  so the Unicode tests failed under some circumstances.
* As we aren't actually linking against any locally-built shared libraries,
  we are passing --disable-shared to libtool which inhibts wrapper generation
  on win32 and fixes the test suite.
* Also use up to date autotools. This didn't fix anything, though.
* test suite: try writing an Unicode filename as well
  * There have been problems doing that on Win32 where UTF-8 was not
    correctly passed down from the command line and some Windows API
    calls were only working with ANSI filenames etc.

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