Patch from Eric VALETTE <valette@crf.canon.fr>:

Here is a enhanced version of my previous patch. This patch enables
    to potentially share the new interrupt management code for all Intel targets
    (pc386, go32 and force386) bsp.

    Note :  this patch is complete only for pc386. It still needs to
            be completed for go32 and force386. I carrefully checked
            that anything needed is in for force386 (only some function
            name changes for IDT manipulation and GDT segment
            manipulation). But anyway I will not be able to test any
            of theses targets...

configure.in

@@ -329,6 +329,7 @@ if test -d "$srcdir/c/src/lib/libbsp/$target_cpu"; then
       if test $? -ne 0 ; then
         bspdirs="$bspdirs $bspdir"
         RTEMS_CHECK_MAKEFILE(c/src/lib/libbsp/$bspcpudir$bspdir)
+        RTEMS_CHECK_MAKEFILE(c/src/lib/libbsp/${bspcpudir}shared)
       fi
     else
       AC_MSG_ERROR([unable to find libbsp directory ($bspdir) for  $i])