Fix FTBFS with GCC6

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 435ea0b78d)

src/crypto.cpp

@@ -630,8 +630,8 @@ For details, see http://sourceforge.net/projects/libb64
 
 int base64_decode_value(char value_in)
 {
-	static const char decoding[] = {62,-1,-1,-1,63,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-2,-1,-1,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51};
-	static const char decoding_size = sizeof(decoding);
+	static const signed char decoding[] = {62,-1,-1,-1,63,52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-2,-1,-1,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51};
+	static const signed char decoding_size = sizeof(decoding);
 	value_in -= 43;
 	if (value_in < 0 || value_in > decoding_size) return -1;
 	return decoding[(int)value_in];

src/upnpmanager.cpp

@@ -133,7 +133,7 @@ UPnPManager* UPnPManager::manager = 0;
             {
                 const net::ForwardPort & s = *i;
                 (*r)->undoForward(net::Port(s.extnumber,s.proto,s.forward),
-                                  net::Port(s.intnumber,s.proto,s.forward),false);
+                                  net::Port(s.intnumber,s.proto,s.forward), 0);
             }
             r++;
 		}