[REVIEW 3-5] Reintroduce pyuno.so wrapper around libpyuno.so

[Stephan Bergmann]

As per <https://bugs.freedesktop.org/show_bug.cgi?id=45696#c3> 
"Importing uno bindings in python causes crash" the master commit 
<http://cgit.freedesktop.org/libreoffice/core/commit/?id=0b1be1ce0e0ac7b34c4b73d53f4bf32ec5df7290> 
"Reintroduce pyuno.so wrapper around libpyuno.so" should please be 
reviewed and cherry-picked to libreoffice-3-5.

(It only actually affects platforms with somewhat old GCC versions, so 
there should typically be no need to backport this to any Linux-distro's 
3.5.0 offerings.)

Thanks,
Stephan