Update buildroot 2018.05

Signed-off-by: Pascal Vizeli <pvizeli@syshack.ch>

buildroot/package/libcurl/0001-Fix-link-with-ssh2-built-with-a-static-mbedtls.patch

@@ -0,0 +1,40 @@
+From b5fbc486e805805efb8400373ccec2a3dee1c81b Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Mon, 21 May 2018 12:07:00 +0200
+Subject: [PATCH 1/1] Fix link with ssh2 built with a static mbedtls
+
+The ssh2 pkg-config file could contain the following lines when build
+with a static version of mbedtls:
+   Libs: -L${libdir} -lssh2 /xxx/libmbedcrypto.a
+   Libs.private: /xxx/libmbedcrypto.a
+
+This static mbedtls library must be used to correctly detect ssh2
+support and this library must be copied in libcurl.pc otherwise
+compilation of any application (such as upmpdcli) with libcurl will fail
+when trying to found mbedtls functions included in libssh2.
+So, replace pkg-config --libs-only-l by pkg-config --libs.
+
+Fixes:
+ - http://autobuild.buildroot.net/results/43e24b22a77f616d6198c10435dcc23cc3b9088a
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+---
+ configure.ac | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index 5569a26b4..9e2606885 100755
+--- a/configure.ac
++++ b/configure.ac
+@@ -2766,7 +2766,7 @@ if test X"$OPT_LIBSSH2" != Xno; then
+     CURL_CHECK_PKGCONFIG(libssh2)
+ 
+     if test "$PKGCONFIG" != "no" ; then
+-      LIB_SSH2=`$PKGCONFIG --libs-only-l libssh2`
++      LIB_SSH2=`$PKGCONFIG --libs libssh2`
+       LD_SSH2=`$PKGCONFIG --libs-only-L libssh2`
+       CPP_SSH2=`$PKGCONFIG --cflags-only-I libssh2`
+       version=`$PKGCONFIG --modversion libssh2`
+-- 
+2.14.1
+

buildroot/package/libcurl/libcurl.mk

@@ -14,6 +14,8 @@ LIBCURL_DEPENDENCIES = host-pkgconf \
 LIBCURL_LICENSE = curl
 LIBCURL_LICENSE_FILES = COPYING
 LIBCURL_INSTALL_STAGING = YES
+# We're patching configure.ac
+LIBCURL_AUTORECONF = YES
 
 # We disable NTLM support because it uses fork(), which doesn't work
 # on non-MMU platforms. Moreover, this authentication method is