Add an option for reproducible library builds

This can be useful to the library packagers, notably under Debian.

Closes #17000.

include/wx/setup_inc.h

@@ -63,6 +63,16 @@
 // Recommended setting: 0
 #define wxUSE_UNSAFE_WXSTRING_CONV 1
 
+// If set to 1, enables "reproducible builds", i.e. build output should be
+// exactly the same if the same build is redone again. As using __DATE__ and
+// __TIME__ macros clearly makes the build irreproducible, setting this option
+// to 1 disables their use in the library code.
+//
+// Default is 0
+//
+// Recommended setting: 0
+#define wxUSE_REPRODUCIBLE_BUILD 0
+
 // ----------------------------------------------------------------------------
 // debugging settings
 // ----------------------------------------------------------------------------