github: Try to avoid crashes by LeakSanitizer

There are spurious crashes after test runs (during the reporting phase
of LeakSanitizer) that are triggered by seemingly unrelated code changes.
It seems to be related to how glibc handles dynamic TLS allocations.

.github/workflows/linux.yml

@@ -53,6 +53,8 @@ jobs:
       MONOLITHIC: ${{ matrix.monolithic || 'no' }}
       CC: ${{ matrix.compiler || 'gcc' }}
       TEST: ${{ matrix.test }}
+      # LSan causes spurious SIGSEGV after tests due to DTLS handling by glibc
+      ASAN_OPTIONS: intercept_tls_get_addr=0
     steps:
       - uses: actions/checkout@v2
       - uses: actions/cache@v2