Completed _scanf.c, added vsscanf.c, rewrote sscanf.c.

Added an assembler include _file.inc and changed asm code that uses struct
FILE to be independent of its size.
Fixed return codes in several files to use EOF instead of -1.


git-svn-id: svn://svn.cc65.org/cc65/trunk@1205 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/common/fclose.c

@@ -15,7 +15,7 @@ int fclose (FILE* f)
     if ((f->f_flags & _FOPEN) == 0) {
 	/* File is not open */
        	_errno = EINVAL;       	       	/* File not input */
-	return -1;
+	return EOF;
     }
 
     /* Reset the flags and close the file */