i#1227 ARM: Replace --thumb-entry with --entry in utils.cmake.
i#1227 ARM: Replace --thumb-entry with --entry in utils.cmake.

With "--thumb-entry" the test programs fib-conflict{,-early} fail, natively
or under DynamoRIO, on Raspbian (Raspberry Pi 3), because the start-up code
is A32 (ARM mode). With "--entry" bit 0 of the entry point is set correctly
depending on whether _start is A32 (ARM) or T32 (Thumb).

Review-URL: https://codereview.appspot.com/310770043

AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio