Add wxOSX_VERIFY_NOERR macro and use it in wxOSX code

This macro replaces the deprecated __Verify_noErr defined in the SDK.

It is different from assert, as the expression given to the macro is
always evaluated and then, if the result is not zero, and asserts are
on, an assert containing a human readable message with the description
of the error code is triggered.

Closes https://github.com/wxWidgets/wxWidgets/pull/1973

Co-authored-by: Vadim Zeitlin <vadim@wxwidgets.org>

include/wx/osx/core/private.h

@@ -1098,5 +1098,17 @@ protected:
     T m_ptr;
 };
 
+// This macro checks if the evaluation of cond, having a return value of
+// OS Error type, is zero, ie no error occurred, and calls the assert handler
+// with the provided message if it isn't.
+#define wxOSX_VERIFY_NOERR(cond)                                          \
+    wxSTATEMENT_MACRO_BEGIN                                               \
+        const unsigned long evalOnce = (cond);                            \
+        if ( evalOnce != 0 )                                              \
+        {                                                                 \
+            wxFAIL_COND_MSG(#cond, GetMacOSStatusErrorString(evalOnce));  \
+        }                                                                 \
+    wxSTATEMENT_MACRO_END
+
 #endif
     // _WX_PRIVATE_CORE_H_