libdvdnav: fix nios2 cross-compile

The host is misdetected as OS/2.

Fixes:
http://autobuild.buildroot.net/results/d5b30d6b5463928ded1a1c1f1f5345a726f6ffaf/
http://autobuild.buildroot.net/results/917041c7165093f44a5d3b4a5ba56a3d1b59e456/
http://autobuild.buildroot.net/results/dcfc53b6fc25210cf70a1abf0e24b85f0d971101/
http://autobuild.buildroot.net/results/79109d06183efa17f6f68c1ea78cbd9927c5c46e/

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Tested-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libdvdnav/0001-do-not-match-nios2-as-os2.patch

@@ -0,0 +1,16 @@
+Fix misdetection while nios2 cross-compile
+
+Signed-off-bye: Waldemar Brodkorb <wbx@openadk.org>
+ 
+diff -Nur libdvdnav-5.0.3.orig/configure.ac libdvdnav-5.0.3/configure.ac
+--- libdvdnav-5.0.3.orig/configure.ac	2015-01-27 16:57:43.000000000 +0100
++++ libdvdnav-5.0.3/configure.ac	2016-07-31 11:48:09.312947473 +0200
+@@ -73,7 +73,7 @@
+   [*mingw32* | *cygwin*], [AC_CHECK_FUNCS(gettimeofday)])
+ 
+ AS_CASE([$host],
+-  [*os2*], [LDFLAGS="$LDFLAGS -no-undefined"])
++  [*-os2*], [LDFLAGS="$LDFLAGS -no-undefined"])
+ 
+ dnl ---------------------------------------------
+ dnl threads

package/libdvdnav/libdvdnav.mk

@@ -11,5 +11,7 @@ LIBDVDNAV_INSTALL_STAGING = YES
 LIBDVDNAV_DEPENDENCIES = libdvdread host-pkgconf
 LIBDVDNAV_LICENSE = GPLv2+
 LIBDVDNAV_LICENSE_FILES = COPYING
+# 0001-do-not-match-nios2-as-os2.patch
+LIBDVDNAV_AUTORECONF = YES
 
 $(eval $(autotools-package))