`pthread_create` symbol not found when statically linking glibc.

[gaoqiangz]

.cargo/config.toml

[target.x86_64-unknown-linux-gnu]
rustflags = ["-C", "target-feature=+crt-static"]

ptr will be null

crash-handling/crash-handler/src/unix/pthread_interpose.rs

Lines 72 to 73 in 0744245

	const RTLD_NEXT: *mut c_void = -1isize as *mut c_void;
	let ptr = libc::dlsym(RTLD_NEXT, c"pthread_create".as_ptr().cast());