Fix function and parameter names, and comment

configure.py

@@ -305,15 +305,15 @@ def binary(name):
 else:
     n.variable('ar', configure_env.get('AR', 'ar'))
 
-def SearchPath(exe_name):
-  """Find an executable (.exe, .bat, whatever) in the system path."""
+def search_system_path(file_name):
+  """Find a file in the system path."""
   for dir in os.environ['path'].split(';'):
-    path = os.path.join(dir, exe_name)
+    path = os.path.join(dir, file_name)
     if os.path.exists(path):
       return path
 
 if platform.is_msvc():
-    if not SearchPath('cl.exe'):
+    if not search_system_path('cl.exe'):
         raise Exception('cl.exe not found. Run again from the Developer Command Prompt for VS')
     cflags = ['/showIncludes',
               '/nologo',  # Don't print startup banner.