netd: Disable unsigned integer overflow checks.

There's a secuity vs. robustness tradeoff to be made here: while
halting execution immediately hardens netd against potential remote
exploits, harmless overflows anywhere in netd could trigger a
crash-loop, making an OTA fix impossible to deliver.

Bug: 72512637
Test: Manually verified that netd boots and runs normally
Test: Inspected compiler generated code with objdump --source -d
Change-Id: Ibba3043c9d857614ccb78147ef505e12400b8eff