romdisk: modify Makefile to be compatible with more releases of z88dk…

…-z80asm

Some releases of z88dk-z80asm present a bug when using -O switch (output to directory).
This commit fixes this issue by manually moving the generated files to the destination folder.

romdisk/Makefile

@@ -15,7 +15,11 @@ FILES_IN_IMG=$(BUILDIR)/$(BIN) simple.txt
 # If z88dk has been install through snap, the binary may be prefixed with "z88dk"
 # So choose any of z88dk-* or z88dk.z88dk-*, as long as one exists
 CC=$(shell which z88dk-z80asm z88dk.z88dk-z80asm | head -1)
-ASMFLAGS=-I$(ZOS_PATH)/kernel_headers/z88dk-z80asm -O$(BUILDIR) -m -b
+
+# On some versions of z88dk, -Oxxx switch does not generate the init_TEXT.bin file,
+# it only creates empty init.bin. Generate all the binaries in the current directory
+# and move them manually
+ASMFLAGS=-I$(ZOS_PATH)/kernel_headers/z88dk-z80asm -m -b
 
 
 .PHONY: all clean
@@ -25,8 +29,10 @@ all: clean
 	    echo "Extra files detected: $(EXTRA_ROMDISK_FILES)" ) || \
 	    echo "No extra file to pack into romdisk"
 	@mkdir -p $(BUILDIR)
-	@echo "Creating romdisk..."
+	@echo "Creating romdisk"
 	$(CC) $(ASMFLAGS) $(SRCS)
+	@echo "Moving generated files"
+	mv *.o ./$(BUILDIR) && mv *.map ./$(BUILDIR) && mv $(basename $(BIN))*.bin ./$(BUILDIR)
 	@# For some reasons, z88dk-z80asm will create an empty `init.bin` file, remove it
 	@rm -f $(BUILDIR)/$(BIN) && mv $(BUILDIR)/*_TEXT.bin $(BUILDIR)/$(BIN)
 	@echo "Packing the files"