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/dlgbox/Makefile

@@ -1,17 +0,0 @@
-#
-# makefile for CC65 runtime library
-#
-
-#--------------------------------------------------------------------------
-# Object files
-
-C_OBJS +=	messagebox.o
-
-S_OBJS +=	dbget2lines.o		\
-		dlgboxgetstring.o	\
-		dlgboxfileselect.o	\
-		dlgboxok.o		\
-		dlgboxokcancel.o	\
-		dlgboxyesno.o		\
-		dodlgbox.o		\
-		rstrfrmdialogue.o