Try to remove yaml sources from depend

ext/psych/depend

@@ -2,30 +2,10 @@ $(OBJS): $(YAML_H)
 
 # AUTOGENERATED DEPENDENCIES START
 api.o: $(RUBY_EXTCONF_H)
-api.o: yaml/api.c
-api.o: yaml/config.h
-api.o: yaml/yaml.h
-api.o: yaml/yaml_private.h
 dumper.o: $(RUBY_EXTCONF_H)
-dumper.o: yaml/config.h
-dumper.o: yaml/dumper.c
-dumper.o: yaml/yaml.h
-dumper.o: yaml/yaml_private.h
 emitter.o: $(RUBY_EXTCONF_H)
-emitter.o: yaml/config.h
-emitter.o: yaml/emitter.c
-emitter.o: yaml/yaml.h
-emitter.o: yaml/yaml_private.h
 loader.o: $(RUBY_EXTCONF_H)
-loader.o: yaml/config.h
-loader.o: yaml/loader.c
-loader.o: yaml/yaml.h
-loader.o: yaml/yaml_private.h
 parser.o: $(RUBY_EXTCONF_H)
-parser.o: yaml/config.h
-parser.o: yaml/parser.c
-parser.o: yaml/yaml.h
-parser.o: yaml/yaml_private.h
 psych.o: $(RUBY_EXTCONF_H)
 psych.o: $(arch_hdrdir)/ruby/config.h
 psych.o: $(hdrdir)/ruby.h
@@ -203,7 +183,6 @@ psych.o: psych_emitter.h
 psych.o: psych_parser.h
 psych.o: psych_to_ruby.h
 psych.o: psych_yaml_tree.h
-psych.o: yaml/yaml.h
 psych_emitter.o: $(RUBY_EXTCONF_H)
 psych_emitter.o: $(arch_hdrdir)/ruby/config.h
 psych_emitter.o: $(hdrdir)/ruby.h
@@ -381,7 +360,6 @@ psych_emitter.o: psych_emitter.h
 psych_emitter.o: psych_parser.h
 psych_emitter.o: psych_to_ruby.h
 psych_emitter.o: psych_yaml_tree.h
-psych_emitter.o: yaml/yaml.h
 psych_parser.o: $(RUBY_EXTCONF_H)
 psych_parser.o: $(arch_hdrdir)/ruby/config.h
 psych_parser.o: $(hdrdir)/ruby.h
@@ -559,7 +537,6 @@ psych_parser.o: psych_parser.c
 psych_parser.o: psych_parser.h
 psych_parser.o: psych_to_ruby.h
 psych_parser.o: psych_yaml_tree.h
-psych_parser.o: yaml/yaml.h
 psych_to_ruby.o: $(RUBY_EXTCONF_H)
 psych_to_ruby.o: $(arch_hdrdir)/ruby/config.h
 psych_to_ruby.o: $(hdrdir)/ruby.h
@@ -737,7 +714,6 @@ psych_to_ruby.o: psych_parser.h
 psych_to_ruby.o: psych_to_ruby.c
 psych_to_ruby.o: psych_to_ruby.h
 psych_to_ruby.o: psych_yaml_tree.h
-psych_to_ruby.o: yaml/yaml.h
 psych_yaml_tree.o: $(RUBY_EXTCONF_H)
 psych_yaml_tree.o: $(arch_hdrdir)/ruby/config.h
 psych_yaml_tree.o: $(hdrdir)/ruby.h
@@ -915,20 +891,7 @@ psych_yaml_tree.o: psych_parser.h
 psych_yaml_tree.o: psych_to_ruby.h
 psych_yaml_tree.o: psych_yaml_tree.c
 psych_yaml_tree.o: psych_yaml_tree.h
-psych_yaml_tree.o: yaml/yaml.h
 reader.o: $(RUBY_EXTCONF_H)
-reader.o: yaml/config.h
-reader.o: yaml/reader.c
-reader.o: yaml/yaml.h
-reader.o: yaml/yaml_private.h
 scanner.o: $(RUBY_EXTCONF_H)
-scanner.o: yaml/config.h
-scanner.o: yaml/scanner.c
-scanner.o: yaml/yaml.h
-scanner.o: yaml/yaml_private.h
 writer.o: $(RUBY_EXTCONF_H)
-writer.o: yaml/config.h
-writer.o: yaml/writer.c
-writer.o: yaml/yaml.h
-writer.o: yaml/yaml_private.h
 # AUTOGENERATED DEPENDENCIES END