Improved doc and samples default target.

The 'all' target deliberately doesn't build the doc nor the samples. But that doesn't mean that the Makefiles in the 'doc' and 'samples' directories must default to the (empty) 'all' target.

doc/Makefile

@@ -9,11 +9,9 @@ endif
 htmldir = $(prefix)/share/doc/cc65$(DESTPACKAGE_SUFFIX)/html
 infodir = $(prefix)/share/info
 
-all mostlyclean:
-
 ifdef CMD_EXE
 
-clean install zip doc:
+doc clean install zip:
 
 else # CMD_EXE
 
@@ -26,6 +24,24 @@ TOC_LEVEL = 2
 
 INSTALL = install
 
+doc: html info
+
+html: $(addprefix ../html/,$(SGMLS:.sgml=.html) doc.css doc.png)
+
+info: $(addprefix ../info/,$(SGMLS:.sgml=.info))
+
+../html ../info:
+	@mkdir $@
+
+../html/%.html: %.sgml header.html | ../html
+	@cd ../html && linuxdoc -B html -s 0 -T $(TOC_LEVEL) -H ../doc/header.html ../doc/$<
+
+../html/doc.%: doc.% | ../html
+	cp $< ../html
+
+../info/%.info: %.sgml | ../info
+	@cd ../info && linuxdoc -B info ../doc/$<
+
 clean:
 	$(RM) -r ../html ../info
 
@@ -45,22 +61,6 @@ ifneq "$(wildcard ../html)" ""
 	@cd .. && zip cc65 html/*.*
 endif
 
-doc: html info
-
-html: $(addprefix ../html/,$(SGMLS:.sgml=.html) doc.css doc.png)
-
-info: $(addprefix ../info/,$(SGMLS:.sgml=.info))
-
-../html ../info:
-	@mkdir $@
-
-../html/%.html: %.sgml header.html | ../html
-	@cd ../html && linuxdoc -B html -s 0 -T $(TOC_LEVEL) -H ../doc/header.html ../doc/$<
-
-../html/doc.%: doc.% | ../html
-	cp $< ../html
-
-../info/%.info: %.sgml | ../info
-	@cd ../info && linuxdoc -B info ../doc/$<
-
 endif # CMD_EXE
+
+all mostlyclean: