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-cbm/disk/Makefile

@@ -1,29 +0,0 @@
-#
-# makefile for CC65 runtime library
-#
-
-#--------------------------------------------------------------------------
-# Object files
-
-S_OBJS +=	changediskdevice.o	\
-		chkdkgeos.o		\
-		dio_cts.o		\
-		dio_openclose.o		\
-		dio_params.o		\
-		dio_qcount.o		\
-		dio_qsize.o		\
-		dio_read.o		\
-		dio_stc.o		\
-		dio_write.o		\
-		dio_writev.o		\
-		enterturbo.o		\
-		exitturbo.o		\
-		findbambit.o		\
-		newdisk.o		\
-		purgeturbo.o		\
-		readblock.o		\
-		readbuff.o		\
-		setgeosdisk.o		\
-		writeblock.o		\
-		writebuff.o		\
-		verwriteblock.o