compiler: implement custom logic for go1.15

For some reason `foo.go` is interpreted as an http URL, and even if we
replace it with `./foo.go` there is an errors with file missing on disk.
Because `CompileWithOptions` should be able to compile file under any
circumstances, we allocate temporary directory base on version used to
compile a binary.

Signed-off-by: Evgeniy Stratonikov <evgeniy@nspcc.ru>

pkg/compiler/debug_test.go

@@ -303,7 +303,8 @@ func TestSequencePoints(t *testing.T) {
 	require.NoError(t, err)
 	require.NotNil(t, d)
 
-	require.Equal(t, d.Documents, []string{"foo.go"})
+	require.Equal(t, 1, len(d.Documents))
+	require.True(t, strings.HasSuffix(d.Documents[0], "foo.go"))
 
 	// Main func has 2 return on 4-th and 6-th lines.
 	ps := d.Methods[0].SeqPoints