collect all diagnostics about binfmt_misc before throwing error

mmdebstrap

@@ -2004,14 +2004,14 @@ sub main() {
 		{
 		    open my $fh, '<', '/proc/filesystems' or error "failed to open /proc/filesystems: $!";
 		    unless (grep /^nodev\tbinfmt_misc$/, (<$fh>)) {
-			error "binfmt_misc not found in /proc/filesystems -- is the module loaded?";
+			warning "binfmt_misc not found in /proc/filesystems -- is the module loaded?";
 		    }
 		    close $fh;
 		}
 		{
 		    open my $fh, '<', '/proc/mounts' or error "failed to open /proc/mounts: $!";
 		    unless (grep /^binfmt_misc \/proc\/sys\/fs\/binfmt_misc binfmt_misc/, (<$fh>)) {
-			error "binfmt_misc not found in /proc/mounts -- not mounted?";
+			warning "binfmt_misc not found in /proc/mounts -- not mounted?";
 		    }
 		    close $fh;
 		}
@@ -2020,10 +2020,10 @@ sub main() {
 		    chomp (my $binfmts = do { local $/; <$fh> });
 		    close $fh;
 		    if ($binfmts eq '') {
-			error "qemu-$options->{qemu} is not a supported binfmt name";
+			warning "qemu-$options->{qemu} is not a supported binfmt name";
 		    }
 		}
-		error "qemu emulation of $nativearch failed for an unknown reason";
+		error "qemu user emulation of $nativearch using binfmt_misc failed";
 	    } elsif ($withemu == 0 and $noemu == 1) {
 		error "arch-test succeeded without emu but not with emu";
 	    } elsif ($withemu == 1 and $noemu == 0) {