locale.c: Move #define to proper location

This symbol dealing with LC_TIME was instead defined with LC_MONETARY.
Move it and add a compilation-time error check that the corresponding
MONETARY symbol and it don't conflict.  (In the old location it was
obvious to the reader that they didn't conflict, but here it is
somewhat less obvious.)

locale.c

@@ -6332,7 +6332,6 @@ S_my_langinfo_i(pTHX_
 
 #          if defined(USE_LOCALE_MONETARY) && defined(HAS_LOCALECONV)
 #            define LANGINFO_RECURSED_MONETARY  0x1
-#            define LANGINFO_RECURSED_TIME      0x2
 
         /* Can't use this method unless localeconv() is available, as that's
          * the way we find out the currency symbol.
@@ -6357,6 +6356,12 @@ S_my_langinfo_i(pTHX_
 
 #          endif
 #          ifdef USE_LOCALE_TIME
+#            define LANGINFO_RECURSED_TIME      0x2
+#            ifdef LANGINFO_RECURSED_MONETARY
+#               if LANGINFO_RECURSED_MONETARY == LANGINFO_RECURSED_TIME
+#                 error LANGINFO_RECURSED_MONETARY must differ from LANGINFO_RECURSED_TIME
+#               endif
+#             endif
 
         /* If we have ruled out being UTF-8, no point in checking further. */
         if (   is_utf8 != UTF8NESS_NO