[compiler-rt][test] Apply CFLAGS from sanitizer_common to all tests (#120798)
Sanitizer-specific tests don't use the sanitizer_common flags, but the
issues they address probably also apply to the individual sanitizers.
This was observed in #119071: moving a test from sanitizer_common to
msan broke it in builds with CMAKE_SYSROOT set, because the --sysroot
argument was no longer applied to the test.