Patch by Robert Scheck <robert@fedoraproject.org> for libisoburn >= 1.5.4 to work around the Debian
specific aclocal/libtool behaviour not covering /usr/lib64 or /lib64 paths for 64 bit libraries.

--- libisoburn-1.5.4/configure					2021-01-30 15:32:57.000000000 +0100
+++ libisoburn-1.5.4/configure.rpath				2021-07-23 03:13:01.956656342 +0200
@@ -11541,10 +11541,13 @@
   # before this can be enabled.
   hardcode_into_libs=yes
 
+  # Add ABI-specific directories to the system library path.
+  sys_lib_dlsearch_path_spec="/lib64 /usr/lib64 /lib /usr/lib"
+
   # Append ld.so.conf contents to the search path
   if test -f /etc/ld.so.conf; then
     lt_ld_extra=`awk '/^include / { system(sprintf("cd /etc; cat %s 2>/dev/null", \$2)); skip = 1; } { if (!skip) print \$0; skip = 0; }' < /etc/ld.so.conf | $SED -e 's/#.*//;/^[	 ]*hwcap[	 ]/d;s/[:,	]/ /g;s/=[^=]*$//;s/=[^= ]* / /g;s/"//g;/^$/d' | tr '\n' ' '`
-    sys_lib_dlsearch_path_spec="/lib /usr/lib $lt_ld_extra"
+    sys_lib_dlsearch_path_spec="$sys_lib_dlsearch_path_spec $lt_ld_extra"
   fi
 
   # We used to test for /lib/ld.so.1 and disable shared libraries on