Fix errors from clang:
gui/simwin.cc:498:11: error: case value evaluates to -1, which cannot be
      narrowed to type 'uint32' (aka 'unsigned int') [-Wc++11-narrowing]
                                        case magic_none: return;
                                             ^
network/pakset_info.cc:14:24: error: non-constant-expression cannot be narrowed
      from type 'obj_type' to 'char' in initializer list [-Wc++11-narrowing]
        char objname[256] = { type, type>>8, type>>16, 0 };
                              ^~~~

Index: gui/simwin.cc
--- gui/simwin.cc.orig
+++ gui/simwin.cc
@@ -492,7 +492,7 @@ void rdwr_all_win(loadsave_t *file)
 				file->rdwr_long(id);
 				// create the matching
 				gui_frame_t *w = NULL;
-				switch(id) {
+				switch(magic_numbers(id)) {
 
 					// end of dialogues
 					case magic_none: return;

Index: network/pakset_info.cc
--- network/pakset_info.cc.orig
+++ network/pakset_info.cc
@@ -11,7 +11,7 @@ void pakset_info_t::append(const char* name, obj_type 
 {
 	chk->finish();
 
-	char objname[256] = { type, type>>8, type>>16, 0 };
+	char objname[256] = { char(type), char(type>>8), char(type>>16), 0 };
 	tstrncpy( objname+3, name, 252 );
 
 	checksum_t *old = info.set( strdup(objname), chk );