v850 files that weren't being removed if !keep-v850

include/opcode/.Sanitize

@@ -31,6 +31,11 @@ else
 	lose_these_too="${tic80_files} ${lose_these_too}"
 fi
 
+if ( echo $* | grep keep\-v850 > /dev/null ) ; then
+	keep_these_too="v850.h ${keep_these_too}"
+else
+	lose_these_too="v850.h ${lose_these_too}"
+fi
 
 # All files listed between the "Things-to-keep:" line and the
 # "Files-to-sed:" line will be kept.  All other files will be removed.
@@ -65,7 +70,6 @@ ppc.h
 pyr.h
 sparc.h
 tahoe.h
-v850.h
 vax.h
 
 Things-to-lose: