This looks like a problem on your side. Line 94 is the correct line for the function in 3.10.0 release.

$ git checkout v3.10.0
$ sed -n '94p' Lib/pdb.py 
def find_function(funcname, filename):

Matej, does your build system perhaps strip off the shebang of Lib/pdb.py? That would explain why you are getting the function on line 93.