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/common/Makefile

@@ -1,18 +0,0 @@
-#
-# makefile for CC65 runtime library
-#
-
-#--------------------------------------------------------------------------
-# Object files
-
-C_OBJS +=	_afailed.o	\
-		_poserror.o	\
-		abort.o		\
-		perror.o	\
-		sleep.o
-
-S_OBJS +=	copydata.o	\
-		memcpy.o	\
-		memmove.o	\
-		memset.o	\
-		zerobss.o