gnu: rust-openssl-sys-0.9: Update to 0.9.68.

* gnu/packages/crates-io.scm (rust-openssl-sys-0.9): Update to 0.9.68.
* gnu/packages/patches/rust-openssl-sys-no-vendor.patch: Add note about
supported versions of openssl.

gnu/packages/crates-io.scm

@@ -31725,14 +31725,14 @@ (define-public rust-openssl-probe-0.1
 (define-public rust-openssl-sys-0.9
   (package
     (name "rust-openssl-sys")
-    (version "0.9.64")
+    (version "0.9.68")
     (source
       (origin
         (method url-fetch)
         (uri (crate-uri "openssl-sys" version))
         (file-name (string-append name "-" version ".tar.gz"))
         (sha256
-         (base32 "1bsim2zk69q1dw6rixn48l1ci8bmz5kvbkgsks2ci079w0pzr7i0"))
+         (base32 "0l2ikxygkza3s5q3lvng4mhisdp2vdrvzkhpwhkx8vgnscjiymqw"))
         (patches (search-patches "rust-openssl-sys-no-vendor.patch"))))
     (build-system cargo-build-system)
     (arguments

gnu/packages/patches/rust-openssl-sys-no-vendor.patch

@@ -2,6 +2,8 @@ https://sources.debian.org/data/main/r/rust-openssl-sys/0.9.53-1/debian/patches/
 "MIT" licensed according to debian/copyright file
 slightly modified to only change the vendored openssl-src dependency
 
+Starting from rust-openssl-sys@0.9.69 Cargo.toml starts searching for openssl-3.0.
+
 --- a/Cargo.toml
 +++ b/Cargo.toml
 @@ -31,14 +31,11 @@