Mark the two dfsan tests that are known to be broken on glibc-2.37
as XFAIL, to make the test suite start passing on Gentoo again.
release_shadow_space.c:29: size_t get_rss_kb(): Assertion `feof(f)' failed.
custom.cpp:1858: void test_sprintf(): Assertion `strcmp(buf, "Hello world!") == 0' failed.
Issue appears to be with the program rather than the instrumentation. Did the behavior of the the libc functions used in the test change?