Fix up configure so it finds mkinstalldirs

As an object lesson in why autoreconf is fundamentally unsafe, the
newer version of nls.m4 no longer handles @MKINSTALLDIRS@.  So add
this back, since our Makefiles depend on it.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/configure b/configure
index 33613bd..1886f8f 100755
--- a/configure
+++ b/configure
@@ -627,6 +627,7 @@
 LIBOBJS
 BUILD_LDFLAGS
 BUILD_CFLAGS
+MKINSTALLDIRS
 INCLUDES
 DO_TEST_SUITE
 ET_DIR
@@ -13386,6 +13387,19 @@
 	INCLUDES="$INCLUDES -D_REENTRANT"
 fi
 
+
+        MKINSTALLDIRS=
+  if test -n "$ac_aux_dir"; then
+    case "$ac_aux_dir" in
+      /*) MKINSTALLDIRS="$ac_aux_dir/mkinstalldirs" ;;
+      *) MKINSTALLDIRS="\$(top_builddir)/$ac_aux_dir/mkinstalldirs" ;;
+    esac
+  fi
+  if test -z "$MKINSTALLDIRS"; then
+    MKINSTALLDIRS="\$(top_srcdir)/mkinstalldirs"
+  fi
+
+
 if test $cross_compiling = no; then
    BUILD_CFLAGS="$CFLAGS $CPPFLAGS $INCLUDES -DHAVE_CONFIG_H"
    BUILD_LDFLAGS="$LDFLAGS"