Update spotifyd to 0.2.24

They've done a lot of cleaning up upstream and are no longer pulling in
stuff via commit hashes so we can remove all the _REV, DISTFILES, SITES
and post-extract stuff for librespot, tremor, etc.

- Back to having an odd SITES work-around for a CARGO_CRATE_DEPENDS:
  wasi-0.9.0 due to the version name.
- Need [Rust 1.40][1] for this owing to [whoami-0.7.0][2] and use of
  `#[non_exhaustive]` per [this issue][3]
- Back to having a patch for nix [per this commit][4] just
  because of the version being used (this is ultimately fixed upstream)
- Most other patches can be (and have been) removed though

[1]: https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1400-2019-12-19
[2]: https://github.com/libcala/whoami/blob/03b0b552f3732d1738b353415ef7dd7bb5555393/changelog.md#070---2019-12-21
[3]: rust-lang/rust#44109
[4]: https://wip.pkgsrc.org/cgi-bin/gitweb.cgi?p=pkgsrc-wip.git;a=commit;h=0a23b3b322a6313f27284baa499924921beeca73

Author: atomicules

spotifyd/Makefile

@@ -0,0 +1,19 @@
+$NetBSD$
+
+Later versions of libc have (correctly) removed `fexecve` for netbsd-like platforms therefore need
+to patch earlier versions of nix that expect this to also be removed.
+
+Fixed upstream in later versions:
+
+https://github.com/nix-rust/nix/blob/922d5ee118a770435b14b08ec4be6f8ae9f7c30a/CHANGELOG.md#fixed-7
+
+--- ../vendor/nix-0.10.0/src/unistd.rs.orig	2018-01-21 20:52:34.000000000 +0000
++++ ../vendor/nix-0.10.0/src/unistd.rs
+@@ -633,7 +633,6 @@ pub fn execvp(filename: &CString, args: 
+ #[cfg(any(target_os = "android",
+           target_os = "freebsd",
+           target_os = "linux",
+-          target_os = "netbsd",
+           target_os = "openbsd"))]
+ #[inline]
+ pub fn fexecve(fd: RawFd, args: &[CString], env: &[CString]) -> Result<Void> {