gas: drop .appfile and .appline

These were used originally to represent "# <line> <file>" constructs
inserted by (typically) compilers when pre-processing. Quite some time
ago they were replaced by .linefile though. Since the original
directives were never documented, we ought to be able to remove support
for them. As a result in a number of case function parameter aren't used
anymore and can hence be dropped.

gas/config/tc-tic54x.c

@@ -4966,7 +4966,7 @@ tic54x_adjust_symtab (void)
     {
       unsigned lineno;
       const char * filename = as_where (&lineno);
-      c_dot_file_symbol (filename, 0);
+      c_dot_file_symbol (filename);
     }
 }