We often see the condition number test failing with
```
C:/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.1.0/../../../../x86_64-w64-mingw32/bin/as.exe: ..\..\..\bin.v2\libs\math\test\condition_number_test.test\a7486d3baaf381a6d13710dc26b7b123\condition_number_test.o: too many sections (32989)
C:\Users\RUNNER~1\AppData\Local\Temp\ccuI2rpi.s: Assembler messages:
C:\Users\RUNNER~1\AppData\Local\Temp\ccuI2rpi.s: Fatal error: can't write 155 bytes to section .text of ..\..\..\bin.v2\libs\math\test\condition_number_test.test\a7486d3baaf381a6d13710dc26b7b123\condition_number_test.o: 'File too big'
```
Use math_unit_test.hpp to fix this.