Move liblog tests and benchmarks to libc++.

Bug: 15193147
Change-Id: Ib063eb9490e40f9d10c0b0f29b7808c729e4fff9
diff --git a/liblog/tests/Android.mk b/liblog/tests/Android.mk
index b1426d3..172b186 100644
--- a/liblog/tests/Android.mk
+++ b/liblog/tests/Android.mk
@@ -44,7 +44,6 @@
 LOCAL_SHARED_LIBRARIES += liblog libm
 LOCAL_SRC_FILES := $(benchmark_src_files)
 LOCAL_MODULE_PATH := $(TARGET_OUT_DATA_NATIVE_TESTS)/$(LOCAL_MODULE)
-include external/stlport/libstlport.mk
 include $(BUILD_EXECUTABLE)
 
 # -----------------------------------------------------------------------------
diff --git a/liblog/tests/benchmark_main.cpp b/liblog/tests/benchmark_main.cpp
index 090394c..e5ef970 100644
--- a/liblog/tests/benchmark_main.cpp
+++ b/liblog/tests/benchmark_main.cpp
@@ -17,6 +17,7 @@
 #include <benchmark.h>
 
 #include <inttypes.h>
+#include <math.h>
 #include <regex.h>
 #include <stdio.h>
 #include <stdlib.h>