Fix PR3988: extern inline functions get strong symbol definitions in
C99 mode.  This is a regression from an earlier patch of mine.

This also simplifies the linkage enums a bit.

llvm-svn: 69069
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index 06118ac..ff6c405d 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -315,10 +315,9 @@
   enum GVALinkage {
     GVA_Internal,
     GVA_ExternInline,
-    GVA_GNUCInline,
     GVA_C99Inline,
     GVA_CXXInline,
-    GVA_Normal
+    GVA_StrongExternal
   };
   
 private: