Remove fork to sed when appending to tagnames

[Albert Chin]

No need to use sed to remove leading comma when appending to $tagnames.

-- 
albert chin (address@hidden)

-- snip snip
2003-06-01  Albert Chin-A-Young  <address@hidden>

        * libtool.m4: No need to use sed to remove leading comma when
        appending to $tagnames.

--- libtool.m4.orig     2003-05-29 09:48:26.360069000 -0500
+++ libtool.m4  2003-05-31 19:13:13.686460000 -0500
@@ -2395,7 +2397,7 @@
 AC_DEFUN([_LT_AC_LANG_CXX],
 [AC_REQUIRE([AC_PROG_CXX])
 AC_REQUIRE([AC_PROG_CXXCPP])
-_LT_AC_SHELL_INIT([tagnames=`echo "$tagnames,CXX" | sed 's/^,//'`])
+_LT_AC_SHELL_INIT([tagnames=${tagnames+${tagnames},}CXX])
 ])# _LT_AC_LANG_CXX
 
 
@@ -2411,7 +2413,7 @@
 # ---------------
 AC_DEFUN([_LT_AC_LANG_F77],
 [AC_REQUIRE([AC_PROG_F77])
-_LT_AC_SHELL_INIT([tagnames=`echo "$tagnames,F77" | sed 's/^,//'`])
+_LT_AC_SHELL_INIT([tagnames=${tagnames+${tagnames},}F77])
 ])# _LT_AC_LANG_F77
 
 
@@ -2432,7 +2434,7 @@
       [ifdef([AC_PROG_GCJ],[AC_REQUIRE([AC_PROG_GCJ])],
         [ifdef([A][M_PROG_GCJ],[AC_REQUIRE([A][M_PROG_GCJ])],
           [AC_REQUIRE([A][C_PROG_GCJ_OR_A][M_PROG_GCJ])])])])])])
-_LT_AC_SHELL_INIT([tagnames=`echo "$tagnames,GCJ" | sed 's/^,//'`])
+_LT_AC_SHELL_INIT([tagnames=${tagnames+${tagnames},}GCJ])
 ])# _LT_AC_LANG_GCJ
 
 
@@ -2441,7 +2443,7 @@
 # enable support for Windows resource files
 AC_DEFUN([AC_LIBTOOL_RC],
 [AC_REQUIRE([LT_AC_PROG_RC])
-_LT_AC_SHELL_INIT([tagnames=`echo "$tagnames,RC" | sed 's/^,//'`])
+_LT_AC_SHELL_INIT([tagnames=${tagnames+${tagnames},}RC])
 ])# AC_LIBTOOL_RC