Silence more Clang trunk -Wdefaulted-function-deleted

...similar to 3db830d3 "Silence new Clang trunk
-Wdefaulted-function-deleted", after fb1d3b58
"loplugin:constfields in sc"

Change-Id: I8358e862e53dd8f57169ba2d2f2c543edb93e2a5
Reviewed-on: https://gerrit.libreoffice.org/61867
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

sc/inc/refhint.hxx

@@ -41,8 +41,8 @@ public:
 
     RefHint(RefHint const &) = default;
     RefHint(RefHint &&) = default;
-    RefHint & operator =(RefHint const &) = default;
-    RefHint & operator =(RefHint &&) = default;
+    RefHint & operator =(RefHint const &) = delete;
+    RefHint & operator =(RefHint &&) = delete;
 
     Type getType() const;
 };

sc/source/filter/inc/formulabase.hxx

@@ -540,8 +540,8 @@ public:
 
     FunctionProvider(FunctionProvider const &) = default;
     FunctionProvider(FunctionProvider &&) = default;
-    FunctionProvider & operator =(FunctionProvider const &) = default;
-    FunctionProvider & operator =(FunctionProvider &&) = default;
+    FunctionProvider & operator =(FunctionProvider const &) = delete;
+    FunctionProvider & operator =(FunctionProvider &&) = delete;
 
     /** Returns the function info for an OOXML function name, or 0 on error. */
     const FunctionInfo* getFuncInfoFromOoxFuncName( const OUString& rFuncName ) const;
@@ -582,8 +582,8 @@ public:
 
     OpCodeProvider(OpCodeProvider const &) = default;
     OpCodeProvider(OpCodeProvider &&) = default;
-    OpCodeProvider & operator =(OpCodeProvider const &) = default;
-    OpCodeProvider & operator =(OpCodeProvider &&) = default;
+    OpCodeProvider & operator =(OpCodeProvider const &) = delete;
+    OpCodeProvider & operator =(OpCodeProvider &&) = delete;
 
     /** Returns the structure containing all token op-codes for operators and
         special tokens used by the Calc document and its formula parser. */