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/atari/Makefile.inc

@@ -0,0 +1,16 @@
+# NUMDRVS        - number of supported drives (max. 16)
+#                  4 bytes for each device are statically allocated
+# LINEBUF        - support line buffered reads from E: (the number specifies
+#                  the length of the buffer)
+# UCASE_FILENAME - all filenames get uppercased
+# DEFAULT_DEVICE - if the string passed to the uppercase function doesn't
+#                  include a device (":" at position 2 or 3), provide "Dn:"
+#                  as a default disk device
+#                  n is the value of DEFAULT_DEVICE, unless DYNAMIC_DD is
+#                  also set, in which case it's overridden by a runtime
+#                  check (on SpartaDOS only)
+#                  needs UCASE_FILENAME to be defined, otherwise no effect
+# DYNAMIC_DD     - determine default disk device at runtime (SpartaDOS only)
+#                  needs DEFAULT_DEVICE to be defined, otherwise no effect
+
+CFLAGS += -Wa -DNUMDRVS=4,-DLINEBUF=80,-DUCASE_FILENAME=1,-DDEFAULT_DEVICE=1,-DDYNAMIC_DD=1