Include wx/math.h according to precompiled headers of wx/wx.h (with other minor cleaning).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39745 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/matrix.cpp

@@ -16,15 +16,15 @@
 #include "wx/wxprec.h"
 
 #ifdef __BORLANDC__
-#pragma hdrstop
+    #pragma hdrstop
 #endif
 
+#include "wx/matrix.h"
+
 #ifndef WX_PRECOMP
     #include "wx/math.h"
 #endif
 
-#include "wx/matrix.h"
-
 static const double pi = M_PI;
 
 wxTransformMatrix::wxTransformMatrix(void)