Changed to pay attention to the 'runtime_library_dirs' list (= 'rpath'
option in the 'build_ext' command):
  * in ccompiler.py: 'gen_lib_options()' now takes 'runtime_library_dirs'
    parameter
  * in unixccompiler.py and msvccompiler.py: now pass
    'self.runtime_library_dirs' to 'gen_lib_options()', and define
    'runtime_library_dir_option()' (although in msvccompiler.py it
    blows up with a DistutilsPlatformError right now!)
diff --git a/Lib/distutils/ccompiler.py b/Lib/distutils/ccompiler.py
index 46dabad..4a8c1d3 100644
--- a/Lib/distutils/ccompiler.py
+++ b/Lib/distutils/ccompiler.py
@@ -770,7 +770,7 @@
 # gen_preprocess_options ()
 
 
-def gen_lib_options (compiler, library_dirs, libraries):
+def gen_lib_options (compiler, library_dirs, runtime_library_dirs, libraries):
     """Generate linker options for searching library directories and
        linking with specific libraries.  'libraries' and 'library_dirs'
        are, respectively, lists of library names (not filenames!) and
@@ -783,6 +783,9 @@
     for dir in library_dirs:
         lib_opts.append (compiler.library_dir_option (dir))
 
+    for dir in runtime_library_dirs:
+        lib_opts.append (compiler.runtime_library_dir_option (dir))
+
     # XXX it's important that we *not* remove redundant library mentions!
     # sometimes you really do have to say "-lfoo -lbar -lfoo" in order to
     # resolve all symbols.  I just hope we never have to say "-lfoo obj.o