[Distutils] Catched a typo

[Bastian Kleineidam]

Patch follows.

Bastian Kleineidam

diff -BurN --minimal --exclude=*.pyc
distutils.orig/distutils/command/build_ext.py
distutils/distutils/command/build_ext.py
--- distutils.orig/distutils/command/build_ext.py       Thu Jul 13
01:15:27 2000
+++ distutils/distutils/command/build_ext.py    Fri Jul 14 14:02:38 2000
@@ -309,7 +309,7 @@
 
 
     def get_source_files (self):
-        self.check_extension_list()
+        self.check_extensions_list(self.extensions)
         filenames = []
 
         # Wouldn't it be neat if we knew the names of header files too...