Bug#860507: qtcharts-opensource-src: FTBFS on armhf: Illegal instruction

["Aaron M. Ucko" <ucko@debian.org>]

Source: qtcharts-opensource-src
Version: 5.7.1-1
Severity: important
Justification: fails to build from source

The armhf build of qtcharts-opensource-src failed:

  /«PKGBUILDDIR»/tests/auto/qml-qtquicktest/target_wrapper.sh  ./tst_qml-qtquicktest 
  make[3]: Entering directory '/«PKGBUILDDIR»/tests/auto/qml'
  make[3]: Nothing to be done for 'check'.
  make[3]: Leaving directory '/«PKGBUILDDIR»/tests/auto/qml'
  Makefile:287: recipe for target 'check' failed
  make[3]: *** [check] Illegal instruction
  make[3]: Leaving directory '/«PKGBUILDDIR»/tests/auto/qml-qtquicktest'
  Makefile:1724: recipe for target 'sub-qml-qtquicktest-check' failed
  make[2]: *** [sub-qml-qtquicktest-check] Error 2

Could you please take a look?  I don't have further details, but
perhaps you can reproduce the error on a porterbox.

Thanks!