Disable all tests that require a leak sanitizer because
OpenBSD does not support it.

Index: absl/types/CMakeLists.txt
--- absl/types/CMakeLists.txt.orig
+++ absl/types/CMakeLists.txt
@@ -241,6 +241,7 @@ absl_cc_test(
 )
 
 # Internal-only target, do not depend on directly.
+if (NOT CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
 absl_cc_library(
   NAME
     conformance_testing
@@ -292,6 +293,7 @@ absl_cc_test(
     absl::type_traits
     GTest::gmock_main
 )
+endif()
 
 absl_cc_library(
   NAME
