Explicitly cast away the const-ness instead of doing it implicitly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173241 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CXCursor.cpp b/tools/libclang/CXCursor.cpp
index bdd06bd..2b2ec39 100644
--- a/tools/libclang/CXCursor.cpp
+++ b/tools/libclang/CXCursor.cpp
@@ -778,7 +778,7 @@
 }
 
 Decl *cxcursor::getCursorDecl(CXCursor Cursor) {
-  return (Decl *)Cursor.data[0];
+  return static_cast<Decl*>(const_cast<void*>(Cursor.data[0]));
 }
 
 Expr *cxcursor::getCursorExpr(CXCursor Cursor) {
@@ -791,15 +791,15 @@
       Cursor.kind == CXCursor_ObjCClassRef)
     return 0;
 
-  return (Stmt *)Cursor.data[1];
+  return static_cast<Stmt*>(const_cast<void*>(Cursor.data[1]));
 }
 
 Attr *cxcursor::getCursorAttr(CXCursor Cursor) {
-  return (Attr *)Cursor.data[1];
+  return static_cast<Attr*>(const_cast<void*>(Cursor.data[1]));
 }
 
 Decl *cxcursor::getCursorParentDecl(CXCursor Cursor) {
-  return (Decl *)Cursor.data[0];
+  return static_cast<Decl*>(const_cast<void*>(Cursor.data[0]));
 }
 
 ASTContext &cxcursor::getCursorContext(CXCursor Cursor) {