Issue #24114: Fix an uninitialized variable in ctypes.util.

The bug only occurs on SunOS when the ctypes implementation searches
for the `crle` program.  Patch by Xiang Zhang.  Tested on SunOS by
Kees Bos.

Lib/ctypes/util.py

@@ -184,6 +184,7 @@ def _findLib_crle(name, is64):
             else:
                 cmd = 'env LC_ALL=C /usr/bin/crle 2>/dev/null'
 
+            paths = None
             with contextlib.closing(os.popen(cmd)) as f:
                 for line in f.readlines():
                     line = line.strip()