aapt: silence memcpy dynamic class warning

Summary:
Silence the following:
warning: destination for this 'memcpy' call is a pointer to dynamic class 'android::ZipEntry::CentralDirEntry'; vtable pointer will be overwritten [-Wdynamic-class-memaccess]
    memcpy(&mCDE, &pEntry->mCDE, sizeof(mCDE));
    ~~~~~~ ^

Test Plan: verified

Reviewers: randall.rushing, synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D40