Add liblog to ubsan `UBSAN_DYNAMIC_LIBS`

[aoli]

Summary

liblog is still required to create ubsan runtimes on Android when ANDROID_API < 21.

[vsk]

LGTM.

compiler-rt/trunk/lib/ubsan/CMakeLists.txt

 append_rtti_flag(OFF UBSAN_STANDALONE_CFLAGS)
 append_list_if(SANITIZER_CAN_USE_CXXABI -DUBSAN_CAN_USE_CXXABI UBSAN_STANDALONE_CFLAGS)
 
 set(UBSAN_CXXFLAGS ${SANITIZER_COMMON_CFLAGS})
 append_rtti_flag(ON UBSAN_CXXFLAGS)
 append_list_if(SANITIZER_CAN_USE_CXXABI -DUBSAN_CAN_USE_CXXABI UBSAN_CXXFLAGS)
 
 append_list_if(COMPILER_RT_HAS_LIBDL dl UBSAN_DYNAMIC_LIBS)
+append_list_if(COMPILER_RT_HAS_LIBLOG log UBSAN_DYNAMIC_LIBS)
 append_list_if(COMPILER_RT_HAS_LIBRT rt UBSAN_DYNAMIC_LIBS)
 append_list_if(COMPILER_RT_HAS_LIBPTHREAD pthread UBSAN_DYNAMIC_LIBS)
 
 add_compiler_rt_component(ubsan)
 
 if(APPLE)
   set(UBSAN_COMMON_SOURCES ${UBSAN_SOURCES})
   if(SANITIZER_CAN_USE_CXXABI)
add_compiler_rt_object_libraries(UbsanDynamicRuntimeThunk
       DEFS ${UBSAN_COMMON_DEFINITIONS})
   endif()
 
   if(COMPILER_RT_HAS_UBSAN)
     # Initializer of standalone UBSan runtime.
     add_compiler_rt_object_libraries(RTUbsan_standalone
       ARCHS ${UBSAN_SUPPORTED_ARCH}
       SOURCES ${UBSAN_STANDALONE_SOURCES} CFLAGS ${UBSAN_STANDALONE_CFLAGS})
-    
     # Standalone UBSan runtimes.
     add_compiler_rt_runtime(clang_rt.ubsan_standalone
       STATIC
       ARCHS ${UBSAN_SUPPORTED_ARCH}
       OBJECT_LIBS RTSanitizerCommon
               RTSanitizerCommonLibc
               RTUbsan
               RTUbsan_standalone
       CFLAGS ${UBSAN_CFLAGS}
       PARENT_TARGET ubsan)
-    
     add_compiler_rt_runtime(clang_rt.ubsan_standalone_cxx
       STATIC
       ARCHS ${UBSAN_SUPPORTED_ARCH}
       OBJECT_LIBS RTUbsan_cxx
       CFLAGS ${UBSAN_CXXFLAGS}
       PARENT_TARGET ubsan)
 
     add_compiler_rt_runtime(clang_rt.ubsan_standalone