Compilation fixes for Linux

Hi,

I made some changes so that ges compiles here (Ubuntu 14.04, 64bit).
Commit c8adc6a is more or less a hack because I didn't know how to link against the 32bit library libpython2.7.so.1.0 properly.
And for commit 9af877a I'm not sure if this can be safely removed as the "$Compiler" section is slightly different from above.