Use external symbols for the CBM kernal jump table functions. This allows

to emulate these functions on platforms where one or more of these functions
are not available (PET, CBM-II).


git-svn-id: svn://svn.cc65.org/cc65/trunk@1544 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/cbm/open.s

@@ -6,6 +6,7 @@
 
         .export         _open
 
+        .import         SETLFS, OPEN, CLOSE
         .import         addysp, popax
         .import         scratch, fnparse, fncomplete, fnset
         .import         opencmdchannel, closecmdchannel, readdiskerror
@@ -15,7 +16,6 @@
 
         .include        "errno.inc"
         .include        "fcntl.inc"
-        .include        "cbm.inc"
         .include        "filedes.inc"