DT_STRSZ Implement strtab boundary checks
DT_FLAGS_1 Warn if flags other than DF_1_NOW|DF_1_GLOBAL are set
Bug: 17552334
Bug: 18186310
(cherry picked from commit 6cdeb5234d7f4523fe9d83974f265d80f10512a6)
Change-Id: I7ffc7bc600798308a77ad949a644949b64250ae2