Bug#933731: audacity: FTBFS on 32-bit arches (except i386)

[Scott Talbert <swt@techie.net>]

Package: audacity
Version: 2.3.2-1
Severity: serious
Justification: fails to build from source (but built successfully in the past)

Dear Maintainer,

audacity 2.3.2-1 appears to FTBFS on 32-bit arches (except for i386):

/usr/include/c++/8/atomic:250: undefined reference to `__atomic_load_8'
/usr/bin/ld: /usr/include/c++/8/atomic:250: undefined reference to `__atomic_load_8'
/usr/bin/ld: audacity-AudioIO.o: in function `std::atomic<double>::store(double, std::memory_order)':
/usr/include/c++/8/atomic:239: undefined reference to `__atomic_store_8'
/usr/bin/ld: audacity-AudioIO.o: in function `std::atomic<double>::load(std::memory_order) const':
/usr/include/c++/8/atomic:250: undefined reference to `__atomic_load_8'
collect2: error: ld returned 1 exit status
make[3]: *** [Makefile:2800: audacity] Error 1
make[3]: Leaving directory '/<<PKGBUILDDIR>>/src'
make[2]: *** [Makefile:1989: all] Error 2
make[2]: Leaving directory '/<<PKGBUILDDIR>>/src'
make[1]: *** [Makefile:820: all-recursive] Error 1
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
dh_auto_build: make -j4 returned exit code 2
make: *** [debian/rules:37: build-arch] Error 255

Could you please take a look?