Limit float printing precision in warning for \markup \left-brace
make test-baseline was failing for me due to commit ece2a735 because of the regression test markup-brace-warning.ly, which expected the warning "defaulting to 10.5 pt", whereas on my machine, the actual warning was "defaulting to 10.499999999999998 pt". Limiting the precision when printing is a stopgap measure.
Edited by Jean Abou Samra