Move <machine/endian.h> somewhere more private.

Bug: http://b/28519060
Change-Id: I1c7811f95f46c65d4152bcf509b6e048c45bc28b
diff --git a/libm/Android.mk b/libm/Android.mk
index 7200e5f..b07e426 100644
--- a/libm/Android.mk
+++ b/libm/Android.mk
@@ -507,7 +507,10 @@
 
 LOCAL_C_INCLUDES_x86 += $(LOCAL_PATH)/i387
 
-LOCAL_C_INCLUDES += $(LOCAL_PATH)/upstream-freebsd/lib/msun/src/
+LOCAL_C_INCLUDES += \
+    $(LOCAL_PATH)/upstream-freebsd/android/include/ \
+    $(LOCAL_PATH)/upstream-freebsd/lib/msun/src/ \
+
 LOCAL_C_INCLUDES_64 += $(LOCAL_PATH)/upstream-freebsd/lib/msun/ld128/
 
 LOCAL_ARM_MODE := arm