RPM build fix (reverted CI changes which will need to be un-reverted or made conditional) and vendor Rust dependencies to make builds much faster in any CI system.

zeroidc/vendor/num_threads/src/freebsd.rs

@@ -0,0 +1,36 @@
+extern crate libc;
+
+use std::num::NonZeroUsize;
+use std::{mem, ptr};
+
+pub(crate) fn num_threads() -> Option<NonZeroUsize> {
+    // Safety: `sysctl` and `getpid` are both thread-safe.
+    // `kip` is only accessed if sysctl() succeeds and agrees with the expected size,
+    // and the data only trusted if both its embedded size and pid match expectations
+    unsafe {
+        let pid = libc::getpid();
+        let mib: [libc::c_int; 4] = [libc::CTL_KERN, libc::KERN_PROC, libc::KERN_PROC_PID, pid];
+        let mut kip: libc::kinfo_proc = mem::zeroed();
+        let expected_kip_len = mem::size_of_val(&kip);
+        let mut kip_len = expected_kip_len;
+
+        let ret = libc::sysctl(
+            mib.as_ptr(),
+            mib.len() as u32,
+            &mut kip as *mut _ as *mut libc::c_void,
+            &mut kip_len,
+            ptr::null(),
+            0,
+        );
+
+        if ret == 0
+            && kip_len == expected_kip_len
+            && kip.ki_structsize == expected_kip_len as i32
+            && kip.ki_pid == pid
+        {
+            NonZeroUsize::new(kip.ki_numthreads as usize)
+        } else {
+            None
+        }
+    }
+}