some more refactoring of Makefiles, preparing for CI

testcode/assembler/Makefile

@@ -0,0 +1,37 @@
+
+# Just the usual way to find out if we're
+# using cmd.exe to execute make rules.
+ifneq ($(shell echo),)
+  CMD_EXE = 1
+endif
+
+ifdef CMD_EXE
+  NULLDEV = nul:
+  DEL = -del /f
+  RMDIR = rmdir /s /q
+else
+  NULLDEV = /dev/null
+  DEL = $(RM)
+  RMDIR = $(RM) -r
+endif
+
+ifdef CC65_HOME
+  AS = $(CC65_HOME)/bin/ca65
+  CC = $(CC65_HOME)/bin/cc65
+  CL = $(CC65_HOME)/bin/cl65
+  LD = $(CC65_HOME)/bin/ld65
+else
+  AS := $(if $(wildcard ../../../bin/ca65*),../../../bin/ca65,ca65)
+  CC := $(if $(wildcard ../../../bin/cc65*),../../../bin/cc65,cc65)
+  CL := $(if $(wildcard ../../../bin/cl65*),../../../bin/cl65,cl65)
+  LD := $(if $(wildcard ../../../bin/ld65*),../../../bin/ld65,ld65)
+endif
+
+all: paramcount.o
+
+paramcount.o: paramcount.s
+	$(AS) -o paramcount.o -l paramcount.lst paramcount.s
+	
+clean:
+	$(RM) paramcount.o
+	$(RM) paramcount.lst