Replace wxEXPLICIT with the 'explicit' keyword

See #17655.

include/wx/scopedarray.h

@@ -24,8 +24,8 @@ class wxScopedArray
 public:
     typedef T element_type;
 
-    wxEXPLICIT wxScopedArray(T * array = NULL) : m_array(array) { }
-    wxEXPLICIT wxScopedArray(size_t count) : m_array(new T[count]) { }
+    explicit wxScopedArray(T * array = NULL) : m_array(array) { }
+    explicit wxScopedArray(size_t count) : m_array(new T[count]) { }
 
     ~wxScopedArray() { delete [] m_array; }
 
@@ -77,7 +77,7 @@ private:                            \
     name & operator=(name const &); \
                                     \
 public:                             \
-    wxEXPLICIT name(T * p = NULL) : m_ptr(p) \
+    explicit name(T * p = NULL) : m_ptr(p) \
     {}                              \
                                     \
     ~name();                        \