Test *alpha_symmetric_transform* fails on AMD Zen (Ryzen, EPYC) system built with GCC

Running ninja test with babl 0.1.72, one test fails.

22/25 alpha_symmetric_transform               FAIL     0.08 s (exit status 255 or signal 127 SIGinvalid)

--- command ---
GI_TYPELIB_PATH='/dev/shm/bee-root/babl/babl-0.1.72-0/build/babl' LD_LIBRARY_PATH='/dev/shm/bee-root/babl/babl-0.1.72-0/build/babl' BABL_PATH='/dev/shm/bee-root/babl/babl-0.1.72-0/build/extensions' /dev/shm/bee-root/babl/babl-0.1.72-0/build/tests/alpha_symmetric_transform
--- stdout ---

--- stderr ---
../source/babl/babl-internal.h:214 babl_log()
        separate alpha 10.2: 100000.007812500!=100000.000000000(ref)  
../source/babl/babl-internal.h:214 babl_log()
        separate alpha 11.1: 49999.996093750!=50000.000000000(ref)  
../source/babl/babl-internal.h:214 babl_log()
        separate alpha 11.2: 499999.968750000!=500000.000000000(ref)  
../source/babl/babl-internal.h:214 babl_log()
        associatd-alpha 10.2: 100000.007812500!=100000.000000000(ref)  
../source/babl/babl-internal.h:214 babl_log()
        associatd-alpha 11.1: 49999.992187500!=50000.000000000(ref)  
../source/babl/babl-internal.h:214 babl_log()
        associatd-alpha 11.2: 499999.937500000!=500000.000000000(ref)  
-------