package/libxmlrpc: Fix build with gcc6

Fixes
http://autobuild.buildroot.net/results/c45/c45530f34bf2074bd204c485615124df928f246c/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libxmlrpc/0006-narrowing.patch

@@ -0,0 +1,20 @@
+Fix build with gcc6
+
+Downloaded from
+https://build.opensuse.org/package/view_file/devel:libraries:c_c++/xmlrpc-c/narrowing.patch
+
+Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
+
+Index: xmlrpc-c-1.33.18/src/cpp/base64.cpp
+===================================================================
+--- xmlrpc-c-1.33.18.orig/src/cpp/base64.cpp
++++ xmlrpc-c-1.33.18/src/cpp/base64.cpp
+@@ -14,7 +14,7 @@ using namespace xmlrpc_c;
+ 
+ namespace {
+ 
+-char const table_a2b_base64[] = {
++signed char const table_a2b_base64[] = {
+     -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+     -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+     -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,