Link directly with libm due to libpng dependency.

Change-Id: I9a9b8c3db025b8391b6a0e96ca24ed9cda3ab9a2
diff --git a/charger/Android.mk b/charger/Android.mk
index 5367a98..de9b184 100644
--- a/charger/Android.mk
+++ b/charger/Android.mk
@@ -17,7 +17,7 @@
 LOCAL_C_INCLUDES := bootable/recovery
 
 LOCAL_STATIC_LIBRARIES := libminui libpixelflinger_static libpng
-LOCAL_STATIC_LIBRARIES += libz libstdc++ libcutils libc
+LOCAL_STATIC_LIBRARIES += libz libstdc++ libcutils libm libc
 
 include $(BUILD_EXECUTABLE)