Issue warning when "make snod" with dexpreopt enabled.
Issue warning when "make snod" with dexpreopt enabled.

Change-Id: I481f963634dd384ed6d3de73dfeeda92b37d227e

xorware/android_build,hagar006/platform_manifest,knone1/platform_manifest,xorware/android_build,pranav01/platform_manifest,Hybrid-Power/startsync,fallouttester/platform_manifest,xorware/android_build,xorware/android_build,see4ri/lolili,xorware/android_build,ND-3500/platform_manifest,RR-msm7x30/platform_manifest