[TySan] Attempt to unbreak build after #169036

If tysan was not in COMPILER_RT_SANITIZERS_TO_BUILD, we used to
get an error after #169036, see comments there for details.

Author: nico

compiler-rt/cmake/config-ix.cmake

@@ -856,6 +856,7 @@ else()
 endif()
 
 if (COMPILER_RT_HAS_SANITIZER_COMMON AND TYSAN_SUPPORTED_ARCH AND
+        "tysan" IN_LIST COMPILER_RT_SANITIZERS_TO_BUILD AND
         OS_NAME MATCHES "Linux|Darwin")
   set(COMPILER_RT_HAS_TYSAN TRUE)
 else()