* configure: Configure gdb directory for bfin.

diff -u src.orig/configure src/configure
--- src.orig/configure	2005-12-27 13:36:54.000000000 +0800
+++ src/configure	2005-12-27 10:23:42.000000000 +0800
@@ -1293,7 +1293,7 @@
     noconfigdirs="$noconfigdirs target-libiberty target-libstdc++-v3 ${libgcj}"
     ;;
   bfin-*-*)
-    noconfigdirs="$noconfigdirs target-libgloss gdb"
+    noconfigdirs="$noconfigdirs target-libgloss"
     if test x${is_cross_compiler} != xno ; then
       target_configdirs="${target_configdirs} target-bsp target-cygmon"
     fi