[Bug sanitizer/63939] [5 Regression] Massive asan failures (356) on darwin

[fxcoudert at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63939

--- Comment #7 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
It's not only a darwin issue: as libbacktrace's README says, "libbacktrace only
supports ELF executables with DWARF debugging information", so obviously there
are other object formats, Mach-O and PE-COFF at least, possibly some other
exotic object formats(?).

So a generic solution still needs to be found. Disabling testing entirely,
while a large part of the functionality is present, seems like a bad idea.