Update z80/tools

[bzxgcs]

Hello! My system version is Macos 9.5, and I can't run wla-gb in z80/tools. Then I downloaded latest wla-gb, but I found the parameter in makefile (-oxi) can't fit the latest version. Could you update files in z80/tools and makefile to latest version?

[bzxgcs]

[cutrus]

Edit makefile and set CFLAGS as separate options (also remove -o - it's not necessary):

  3 #CFLAGS = -oxi
  4 CFLAGS = -x -v -i                                                                                                                   
  5 LD = tools/wlalink