Minor changes to lex.am and yacc.am

[Magnus Fromreide]

In the rules from lex.am and yacc.am, if the item %OBJ% or the variable
LEX_OUTPUT_ROOT in lex.am contains a / then the sed expression fails.

A patch proposal is available below but I have no problems with changing
the separator character so something other than #, : do come to mind.
Another approach could be to scan the known input string and chose a
character that is known not to clash, this would solve the problem for the
yacc case but possibly not for the lex case.

*** lib/am/lex.am       14 Dec 2001 16:25:37 -0000      1.6
--- lib/am/lex.am       8 Feb 2002 07:04:04 -0000
***************
*** 28,33 ****
  else !%?MORE-THAN-ONE%
        %COMPILE% %SOURCE%
  ## Edit out `#line' or `#' directives.
!       sed '/^#/ s/$(LEX_OUTPUT_ROOT)\.c/%OBJ%/' $(LEX_OUTPUT_ROOT).c
>%OBJ%
        rm -f $(LEX_OUTPUT_ROOT).c
  endif !%?MORE-THAN-ONE%
--- 28,33 ----
  else !%?MORE-THAN-ONE%
        %COMPILE% %SOURCE%
  ## Edit out `#line' or `#' directives.
!       sed '/^#/ s;$(LEX_OUTPUT_ROOT)\.c;%OBJ%;' $(LEX_OUTPUT_ROOT).c
>%OBJ%
        rm -f $(LEX_OUTPUT_ROOT).c
  endif !%?MORE-THAN-ONE%
*** lib/am/yacc.am      28 Jan 2002 00:40:10 -0000      1.11
--- lib/am/yacc.am      8 Feb 2002 07:04:04 -0000
***************
*** 23,29 ****
  else !%?MORE-THAN-ONE%
        %COMPILE% %SOURCE%
  ## Edit out `#line' or `#' directives.
!       sed '/^#/ s/y\.tab\.c/%OBJ%/' y.tab.c >%OBJ%
        rm -f y.tab.c
  ## Edit out Bison multiple inclusion guards.  It may be BISON_Y_TAB_H,
  ## or Y_TAB_H depending upon the version, that's why the regexp is
--- 23,29 ----
  else !%?MORE-THAN-ONE%
        %COMPILE% %SOURCE%
  ## Edit out `#line' or `#' directives.
!       sed '/^#/ s;y\.tab\.c;%OBJ%;' y.tab.c >%OBJ%
        rm -f y.tab.c
  ## Edit out Bison multiple inclusion guards.  It may be BISON_Y_TAB_H,
  ## or Y_TAB_H depending upon the version, that's why the regexp is