Replaced whole bunch for Makefiles with a single generic Makefile.

- No complex shell logic.
- "Source file shadowing" for all targets via vpath.
- Dependency handling.
- True incremental build.
- Don't write into source directories.
- Easy cleanup by just removing 'wrk'.

libsrc/geos-common/menuicon/Makefile

@@ -1,14 +0,0 @@
-#
-# makefile for CC65 runtime library
-#
-
-#--------------------------------------------------------------------------
-# Object files
-
-S_OBJS +=	doicons.o		\
-		domenu.o		\
-		dopreviousmenu.o	\
-		gotofirstmenu.o		\
-		recoverallmenus.o	\
-		recovermenu.o		\
-		redomenu.o