[JVM] Some more fudges for Proc::Async

S17-procasync/encoding.t

@@ -10,6 +10,7 @@ plan 13;
     $proc.stdout.tap(quit => { $quit = True });
     $proc.stderr.tap(quit => { $oops = True });
     await $proc.start;
+    #?rakudo.jvm todo 'unknown problem'
     ok $quit, 'stdout Supply quit on encoding error';
     nok $oops, 'No bogus quit on stderr Supply';
 }
@@ -21,6 +22,7 @@ plan 13;
     $proc.stdout.tap(quit => { $oops = True });
     $proc.stderr.tap(quit => { $quit = True });
     await $proc.start;
+    #?rakudo.jvm todo 'unknown problem'
     ok $quit, 'stderr Supply quit on encoding error';
     nok $oops, 'No bogus quit on stdout Supply';
 }

S17-procasync/stress.t

@@ -54,6 +54,7 @@ for 1..10 {
 # to repro the bug this is covering (bug present in 2017 commit ce12e480316
 # RT #131763
 if run :!out, :!err, «echo test» {
+  #?rakudo.jvm todo 'hangs'
   doesn't-hang ｢
       for ^100 {
           my $proc = Proc::Async.new: «echo test»;
@@ -75,6 +76,7 @@ else {
 # produces output too slowly to trigger the bug (bug is present in 2016.10
 # rakudo release). So we use `perl` here for that.
 if run :!out, :!err, «perl -e 'print 42'» {
+    #?rakudo.jvm todo 'Unknown encoding utf8-c8'
     is_run ｢
         react {
             my $null = $*SPEC.devnull.&open: :w;

S17-supply/syntax.t

@@ -336,7 +336,6 @@ plan 83;
     is $i, 3, 'blockless react/whenever works';
 }
 
-#?rakudo.jvm skip 'hangs'
 {
     my $trigger1 = Supplier.new;
     my $trigger2 = Supplier.new;