Issue #4864: test_msvc9compiler failed on VC6/7.

Reviewed by Amaury Forgeot d'Arc.

Lib/distutils/tests/test_msvc9compiler.py

@@ -13,6 +13,10 @@ class msvc9compilerTestCase(unittest.TestCase):
         if sys.platform != 'win32':
             # this test is only for win32
             return
+        from distutils.msvccompiler import get_build_version
+        if get_build_version() < 8.0:
+            # this test is only for MSVC8.0 or above
+            return
         from distutils.msvc9compiler import query_vcvarsall
         def _find_vcvarsall(version):
             return None