Avoid cl65 in tests.

cl65 creates intermediate files based on the source file name in the source file directory. Calling cl65 in parallel with the same source file causes those intermediate files to get overwritten.

Fixes #1080

test/dasm/Makefile

@@ -8,12 +8,10 @@ ifdef CMD_EXE
   EXE = .exe
   MKDIR = mkdir $(subst /,\,$1)
   RMDIR = -rmdir /s /q $(subst /,\,$1)
-  DEL = del /f $(subst /,\,$1)
 else
   EXE =
   MKDIR = mkdir -p $1
   RMDIR = $(RM) -r $1
-  DEL = $(RM) $1
 endif
 
 ifdef QUIET
@@ -25,7 +23,7 @@ DA65 := $(if $(wildcard ../../bin/da65*),../../bin/da65,da65)
 
 WORKDIR = ../../testwrk/dasm
 
-DIFF = $(WORKDIR)/isequal$(EXE)
+ISEQUAL = $(WORKDIR)/isequal$(EXE)
 
 CC = gcc
 CFLAGS = -O2
@@ -44,7 +42,7 @@ all: $(BINS)
 $(WORKDIR):
 	$(call MKDIR,$(WORKDIR))
 
-$(DIFF): ../isequal.c | $(WORKDIR)
+$(ISEQUAL): ../isequal.c | $(WORKDIR)
 	$(CC) $(CFLAGS) -o $@ $<
 
 define DISASS_template
@@ -55,10 +53,10 @@ $(WORKDIR)/$1-disass.bin: $1-disass.s | $(WORKDIR)
 $(WORKDIR)/$1-reass.s: $(WORKDIR)/$1-disass.bin
 	$(DA65) --cpu $1 $(START) -o $$@ $$<
 
-$(WORKDIR)/$1-reass.bin: $(WORKDIR)/$1-reass.s $(DIFF)
+$(WORKDIR)/$1-reass.bin: $(WORKDIR)/$1-reass.s $(ISEQUAL)
 	$(if $(QUIET),echo dasm/$1-reass.bin)
 	$(CL65) --cpu $1 -t none $(START) -o $$@ $$<
-	$(DIFF) $$@ $(WORKDIR)/$1-disass.bin
+	$(ISEQUAL) $$@ $(WORKDIR)/$1-disass.bin
 
 endef # DISASS_template
 
@@ -66,4 +64,3 @@ $(foreach cpu,$(CPUS),$(eval $(call DISASS_template,$(cpu))))
 
 clean:
 	@$(call RMDIR,$(WORKDIR))
-	@$(call DEL,$(SOURCES:.s=.o))