rustc segfaults with libfaketime since jemalloc release

[kpcyrd]

Steps to reproduce:

% cargo new --bin foo && cd foo && faketime -m -f '+1m' cargo build
     Created binary (application) `foo` package
error: process didn't exit successfully: `rustc -vV` (signal: 11, SIGSEGV: invalid memory reference)
%

This is related to: https://github.com/wolfcw/libfaketime/issues/130 https://github.com/rust-lang/rust/issues/60461

I'm leaving this here to keep track of the issue since this also broke reprotest.

[tarcieri]

Fun times