Clean step for libc.
Clean step for libc.

(cherry-pick of ab1e93d4d4f4a46fa922df5ba7ccd41dde1221ac.)

Change-Id: I304312d6eb0346c050d02bd834565e0d43d8b4dd

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