1.0.21.22: COMPILE-FILE and toplevel symbols

1.0.21.22: COMPILE-FILE and toplevel symbols

 * The fopcompiler elided unused symbol references completely: warn
   and dump the appropriate SYMBOL-VALUE form even if the value is
   unused is the variable is undefined.

 * This reveals a missing start of a block comment in
   src/pcl/dfun.lisp -- fix it. Did you realize that ||# reads as a
   symbol? I didn't. One strike against using the "emacs friendly"
   #||...||# instead of #|...|#.

 * Also fix on #-sb-unicode issue in the test-suite.