[Bug testsuite/90379] Gcc 9.1 fails "make check" on linux due to missing MacOS-specific header file

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90379

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
You need to do 'make -k check' since some tests are always expected to fail.