include the right ltdl.h

[Ralf Wildenhues]

This patch makes sure you use the in-tree ltdl.h if necessary,
thus fixing a build failure (e.g., if the ltdl.h that is found in the
default paths is an old one, or none is found there).

Cheers,
Ralf

        * Makefile.am (AM_CPPFLAGS): Add $(LTDLINCL), so the right
        ltdl.h is used.

Index: Makefile.am
===================================================================
RCS file: /cvsroot/m4/m4/Makefile.am,v
retrieving revision 1.26
diff -u -r1.26 Makefile.am
--- Makefile.am 13 Jun 2006 01:19:09 -0000      1.26
+++ Makefile.am 13 Jun 2006 09:06:32 -0000
@@ -29,7 +29,7 @@
 AM_CPPFLAGS    = -I. -I$(srcdir) \
                  -Ignu -I$(srcdir)/gnu \
                  -Im4 -I$(srcdir)/m4\
-                 $(INTLINCL)
+                 $(INTLINCL) $(LTDLINCL)
 AM_LDFLAGS     = -no-undefined -export-dynamic
 
 EXTRA_DIST     = bootstrap $(config_aux_dir)/mkstamp