Added 'sim6502' and 'sim65C02' targets.

The targets allow to run cc65 programs in the sim65 exection
einvironment. As there are no "real" i/o facilities there's no
need for header files. Paravirtualized entry points are mapped
to $FFF0 ff. There's a large cc65 progam area from $0200-$FFEF.

The binary format includes a one-byte header indicating the required
execution environment: The value 0 means 6502 and the value 1
means 65C02. The load adress for the binary is fixed to $0200.

Note: Running sim65C02 programs currently doesn't work bcause
sim65 doesn't actually implement 65C02 opcodes.

libsrc/Makefile

@@ -18,6 +18,8 @@ TARGETS = apple2    \
           $(GEOS)   \
           lynx      \
           nes       \
+          sim6502   \
+          sim65c02  \
           supervision
 
 DRVTYPES = emd \
@@ -94,6 +96,8 @@ ifeq ($(TARGET),apple2enh)
   OBJPFX = a2
   DRVPFX = a2e
   SRCDIR = apple2
+else ifeq ($(TARGET),sim65c02)
+  SRCDIR = sim6502
 else
   SRCDIR = $(TARGET)
 endif