Report errors to the log, not just stderr.

In particular this affects assert(3) and __cxa_pure_virtual, both of
which have managed to confuse people this week by apparently aborting
without reason. (Because stderr goes nowhere, normally.)

Bug: 6852995
Bug: 6840813
Change-Id: I7f5d17d5ddda439e217b7932096702dc013b9142
diff --git a/libstdc++/Android.mk b/libstdc++/Android.mk
index 8bc181f..7d27aa8 100644
--- a/libstdc++/Android.mk
+++ b/libstdc++/Android.mk
@@ -3,7 +3,7 @@
 # Common C++ flags to build this library.
 # Note that we need to access private Bionic headers
 # and define ANDROID_SMP accordingly.
-libstdc++_cflags := -Ibionic/libc/private
+libstdc++_cflags := -Ibionic/libc/
 ifeq ($(TARGET_CPU_SMP),true)
     libstdc++_cflags += -DANDROID_SMP=1
 else