Change comment to match reality

See include/vcl/devicecoordinate.hxx.

(But why do we use the vague 'long' and not sal_Int32? Note that
'long' is not necessarily any "longer" than 'int', so if we don't want
to use (the admittedly ugly-looking) 'sal_Int32', why not simply
'int'?)

Change-Id: I8d27b43b64eaed86dd95eb89866db8d5680cc60b

config_host/config_vcl.h.in

@@ -6,8 +6,8 @@ Settings about vcl
 #ifndef CONFIG_VCL_H
 #define CONFIG_VCL_H
 
-/* nature of the device pixel coordinate system
- * either use sal_Int32 or double for coordinates
+/* Nature of the device pixel coordinate system.
+ * We either use long or double for coordinates.
  */
 #define VCL_FLOAT_DEVICE_PIXEL 0