libltdl: Fix libltdl early failures for multi-arch

Since there could be multiple files for libltdl to try dlopening,
libltdl should not fail after the first attempted file.

Reported: https://savannah.gnu.org/support/?111214

* libltdl/ltdl.c: Change return if dlopen() fails.
* libltdl/ltdl.mk: Update serial.

libltdl/ltdl.c

diff --git a/libltdl/ltdl.c b/libltdl/ltdl.c
index 74bfe43..6049541 100644
--- a/libltdl/ltdl.c
+++ b/libltdl/ltdl.c
@@ -785,10 +785,9 @@
   if (notfound)
     return 0;
 
-  /* Try to dlopen the file, but do not continue searching in any
-     case.  */
+  /* Try to dlopen the file. */
   if (tryall_dlopen (phandle, filename, advise, 0) != 0)
-    *phandle = 0;
+    return 0;
 
   return 1;
 }

libltdl/ltdl.mk

diff --git a/libltdl/ltdl.mk b/libltdl/ltdl.mk
index 4610977..0cb427d 100644
--- a/libltdl/ltdl.mk
+++ b/libltdl/ltdl.mk
@@ -35,7 +35,7 @@
 			  -I$(srcdir)/libltdl -Ilibltdl/libltdl \
 			  -I$(srcdir)/libltdl/libltdl
 AM_LDFLAGS	       += -no-undefined
-LTDL_VERSION_INFO	= -version-info 10:4:3
+LTDL_VERSION_INFO	= -version-info 10:5:3
 
 noinst_LTLIBRARIES	+= $(LT_DLLOADERS)