Suggest a better solution for a make without wildcard support.

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@@ -33,9 +33,8 @@ your make has a problem with this rule, you will see an error like this:
 
     Don't know how to make ./*.c
 
-You can change the "proto.h-tstamp" target to omit its prerequisite args,
-but keep in mind that this will make a manual removal of "proto.h-tstamp"
-necessary anytime the function prototypes change.
+You can change the "proto.h-tstamp" target in Makefile.in to list all the *.c
+filenames explicitly in order to avoid this issue.
 
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