./build.py fails on Solaris OS

[jenda1]

On Solaris the libpython.so is located in $prefix/lib/64/ dir. But because build.py:GetPossiblePythonLibraryDirectories()

ycmd/build.py

Lines 292 to 296 in d1707c1

 return [ 
   sysconfig.get_config_var( 'LIBPL' ), 
   p.join( prefix, 'lib64' ), 
   p.join( prefix, 'lib' ) 
 ] 

does not check this directory, the build fails on Solaris OS.