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/nes/Makefile.inc

@@ -0,0 +1,8 @@
+../tgi/nes-64-56-2.tgi:	../wrk/nes/clrscr.o \
+                        ../wrk/nes/cputc.o  \
+                        ../wrk/nes/get_tv.o \
+                        ../wrk/nes/gotoxy.o \
+                        ../wrk/nes/popa.o   \
+                        ../wrk/nes/ppu.o    \
+                        ../wrk/nes/ppubuf.o \
+                        ../wrk/nes/setcursor.o