Add msan and asan env variables to .travis.yml

This way the CI tests don't fail on a null allocation.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>

.travis.yml

@@ -34,6 +34,10 @@ jobs:
           packages:
           - clang-10
           - gnutls-bin
+      env:
+        # Platform tests have an allocation that returns null
+        - ASAN_OPTIONS="allocator_may_return_null=1"
+        - MSAN_OPTIONS="allocator_may_return_null=1"
       script:
         # Do a manual build+test sequence rather than using all.sh,
         # because there's no all.sh component that does what we want,