Suppress TSAN errors from libfstrm.so

dnstap_test produces TSAN errors which originate in libfstrm.so. Unless
libfstrm is TSAN clean or a workaround is placed in libfstrm sources,
suppressing TSAN coming from libfstrm is necessary to test DNSTAP under
TSAN.

(cherry picked from commit c97c6fbfea)

.gitlab-ci.yml

@@ -1023,7 +1023,7 @@ system:gcc:tsan:
 
 unit:gcc:tsan:
   variables:
-    TSAN_OPTIONS: ${TSAN_OPTIONS_COMMON}
+    TSAN_OPTIONS: ${TSAN_OPTIONS_COMMON} suppressions=$CI_PROJECT_DIR/tsan-suppressions.txt
   <<: *base_image
   <<: *unit_test_tsan_job
   needs:
@@ -1050,7 +1050,7 @@ system:clang:tsan:
 
 unit:clang:tsan:
   variables:
-    TSAN_OPTIONS: ${TSAN_OPTIONS_COMMON}
+    TSAN_OPTIONS: ${TSAN_OPTIONS_COMMON} suppressions=$CI_PROJECT_DIR/tsan-suppressions.txt
   <<: *base_image
   <<: *unit_test_tsan_job
   needs:

tsan-suppressions.txt

@@ -0,0 +1,2 @@
+# Uninstrumented library.
+called_from_lib:libfstrm.so