ndk: Update platform system libraries.

This change updates various system libraries to reflect changes that
happened during distinct platform releases. All details are in the
file bionic/libc/docs/CHANGES.TXT, but the summary is:

API level 5:
    pthread.h:
        pthread_mutex_lock_timeout_np()
        pthread_cond_timedwait_monotonic_np()
        pthread_cond_timedwait_relative_np()

API level 8:
    pthread.h:
        pthread_condattr_init()
        pthread_condattr_destroy()
        pthread_condattr_setpshared()
        pthread_condattr_getpshared()

    dlfcn.h:
        dladdr()

    sched.h:
        clone()

    signal.h:
        killpg()

    stdio.h:
        fdprintf()
        vfdprintf()

    unistd.h:
        getusershell()
        setusershell()
        endusershell()

    wchar.h:
        mbstowcs()
        wcstombs()

    time.h:
        timezone
        daylight

    plus symbols from new headers: <fts.h>, <regex.h>, <err.h>, <warn.h>

Change-Id: I7ff1ffa2cb37b71473b1d137c7799f17d644ab63
diff --git a/ndk/platforms/android-5/arch-arm/lib/libc.so b/ndk/platforms/android-5/arch-arm/lib/libc.so
new file mode 100644
index 0000000..2483bf7
--- /dev/null
+++ b/ndk/platforms/android-5/arch-arm/lib/libc.so
Binary files differ
diff --git a/ndk/platforms/android-8/arch-arm/lib/libc.so b/ndk/platforms/android-8/arch-arm/lib/libc.so
new file mode 100644
index 0000000..b965d04
--- /dev/null
+++ b/ndk/platforms/android-8/arch-arm/lib/libc.so
Binary files differ
diff --git a/ndk/platforms/android-8/arch-arm/lib/libdl.so b/ndk/platforms/android-8/arch-arm/lib/libdl.so
new file mode 100644
index 0000000..3319c4c
--- /dev/null
+++ b/ndk/platforms/android-8/arch-arm/lib/libdl.so
Binary files differ