fix linking with .so files specified in cmd line (this fixes some libtool usages)

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@54623 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/ccc b/utils/ccc
index 43ded02..d999d2b 100755
--- a/utils/ccc
+++ b/utils/ccc
@@ -217,7 +217,7 @@
     if action == 'link':
         for i, file in enumerate(files):
             ext = extension(file)
-            if ext != "o" and ext != "a":
+            if ext != "o" and ext != "a" and ext != "so":
                 out = changeextension(file, "o")
                 args = ['-o', out, file] + compile_opts
                 compile(args)