The ruby/assert.h is adopted by Ruby 2.7 or later

Author: aycabta

ext/readline/depend

@@ -1,7 +1,6 @@
 # AUTOGENERATED DEPENDENCIES START
 readline.o: $(RUBY_EXTCONF_H)
 readline.o: $(arch_hdrdir)/ruby/config.h
-readline.o: $(hdrdir)/ruby/assert.h
 readline.o: $(hdrdir)/ruby/backward.h
 readline.o: $(hdrdir)/ruby/defines.h
 readline.o: $(hdrdir)/ruby/encoding.h