Coding - Fix compilation warnings (#1034)

- Added version guard for Clang compiler to conditionally apply `-Wcast-function-type-mismatch` pragma
- Wrapped deprecated `Standard_HMutex` typedef with deprecation warning suppression macros

src/FoundationClasses/TKernel/Standard/Standard_Mutex.hxx

@@ -173,8 +173,14 @@ private:
 };
 
 //! @deprecated Use std::shared_ptr<std::mutex> instead. Will be removed in OCCT 8.0.0.
+Standard_DISABLE_DEPRECATION_WARNINGS;
+
+Standard_DEPRECATED("Standard_HMutex is deprecated; use std::shared_ptr<std::mutex> instead. "
+                    "Will be removed in OCCT 8.0.0")
 typedef NCollection_Shared<Standard_Mutex> Standard_HMutex;
 
+Standard_ENABLE_DEPRECATION_WARNINGS;
+
 // Implementation of the method Unlock is inline, since it is
 // just a shortcut to system function
 inline void Standard_Mutex::Unlock()

src/FoundationClasses/TKernel/Standard/Standard_WarningDisableFunctionCast.hxx

@@ -25,7 +25,9 @@
 //! suppressing it is the only feasible way to avoid it. As this warning still can point out broken
 //! places, it should be suppressed only locally, where usage of function cast has been verified.
 #if defined(__clang__)
-  #pragma clang diagnostic ignored "-Wcast-function-type-mismatch"
+  #if __clang_major__ >= 16
+    #pragma clang diagnostic ignored "-Wcast-function-type-mismatch"
+  #endif
 #elif defined(__GNUC__) && !defined(__INTEL_COMPILER)
   #if (__GNUC__ > 8) || ((__GNUC__ == 8) && (__GNUC_MINOR__ >= 1))
     #pragma GCC diagnostic ignored "-Wcast-function-type"