m68k: Define __div64_32() to avoid a warning

The generic __div64_32() definition is built on all architectures that
don't provide this as a macro.  m68k however neither defines nor
requires __div64_32, so it should define an empty one to avoid the
warning:

    lib/math/div64.c:31:32: error: no previous prototype for '__div64_32' [-Werror=missing-prototypes]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20230809211057.60514-1-arnd@kernel.orgSigned-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/include/asm/div64.h

@@ -31,6 +31,9 @@
 	__rem;							\
 })
 
+/* defining this stops the unused helper function from being built */
+#define __div64_32 __div64_32
+
 #endif /* CONFIG_CPU_HAS_NO_MULDIV64 */
 
 #endif /* _M68K_DIV64_H */