Missing header in WaveClip.cpp

[mohd-akram]

Bug description

I'm getting a build error on macOS 10.14 due to a missing <cmath> header in WaveClip.cpp.

Steps to reproduce

1. Build the program

Expected behavior

Builds successfully

Actual behavior

/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_audio_audacity/audacity/work/audacity-sources-3.5.1/libraries/lib-wave-track/WaveClip.cpp:1325:11: error: no member named 'round' in namespace 'std'; did you mean 'roundl'?
   return std::round(t * mRate) / mRate;
          ^~~~~~~~~~
          roundl
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/math.h:477:20: note: 'roundl' declared here
extern long double roundl(long double);
                   ^
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_audio_audacity/audacity/work/audacity-sources-3.5.1/libraries/lib-wave-track/WaveClip.cpp:1372:16: error: no member named 'floor' in namespace 'std'
   return std::floor(GetPlayDuration() * mRate + 0.5) < 2.0;
          ~~~~~^
/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_audio_audacity/audacity/work/audacity-sources-3.5.1/libraries/lib-wave-track/WaveClip.cpp:1436:12: error: no member named 'ceil' in namespace 'std'
      std::ceil(quarters * secondsPerQuarter * GetRate()) / GetRate();
      ~~~~~^

Audacity Version

other

Operating system

macOS

Additional context

Full log