gnu: rust-libssh2-sys-0.2: Don't hide package.

* gnu/packages/crates-io.scm (rust-libssh2-sys-0.2)[arguments]: Add
rust-libc-0.2, rust-libz-sys-1.0, rust-openssl-sys-0.9, rust-cc-1.0,
rust-pkg-config-0.3, rust-vcpkg-0.2 to cargo-inputs. Add custom phase to
unbundle vendored sources and set environment variables.
[native-inputs]: Add libssh2, openssl, pkg-config, zlib.
[properties]: Remove field.

gnu/packages/crates-io.scm

@@ -28,6 +28,7 @@
   #:use-module (guix packages)
   #:use-module (gnu packages compression)
   #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages ssh)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages version-control))
 
@@ -5688,27 +5689,42 @@ functions and static variables these libraries contain.")
          (base32
           "1zb6gsw795nq848nk5x2smzpfnn1s15wjlzjnvr8ihlz2l5x2549"))))
     (build-system cargo-build-system)
-    ;(arguments
-    ; `(#:phases
-    ;  (modify-phases %standard-phases
-    ;    (add-after 'unpack 'find-openssl
-    ;      (lambda* (#:key inputs #:allow-other-keys)
-    ;        (let ((openssl (assoc-ref inputs "openssl")))
-    ;          (setenv "OPENSSL_DIR" openssl))
-    ;        (delete-file-recursively "libssh2")
-    ;        (setenv "LIBSSH2_SYS_USE_PKG_CONFIG" "1")
-    ;        #t)))))
-    ;(native-inputs
-    ; `(("pkg-config" ,pkg-config)))
-    ;(inputs
-    ; `(("libssh2" ,libssh2)
-    ;   ("openssl" ,openssl)
-    ;   ("zlib" ,zlib)))
+    (arguments
+     `(#:skip-build? #t ; it wants rust-openssl-src
+       #:cargo-inputs
+       (("rust-libc" ,rust-libc-0.2)
+        ("rust-libz-sys" ,rust-libz-sys-1.0)
+        ("rust-openssl-sys" ,rust-openssl-sys-0.9)
+        ;; Build dependencies:
+        ("rust-cc" ,rust-cc-1.0)
+        ("rust-pkg-config" ,rust-pkg-config-0.3)
+        ("rust-vcpkg" ,rust-vcpkg-0.2))
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'configure 'dont-vendor-sources
+           (lambda* (#:key inputs #:allow-other-keys)
+             (let ((openssl (assoc-ref inputs "openssl")))
+               (setenv "OPENSSL_DIR" openssl))
+             (delete-file-recursively "libssh2")
+             (delete-file-recursively
+               (string-append "guix-vendor/rust-libssh2-sys-"
+                              ,(package-version rust-libssh2-sys-0.2)
+                              ".crate/libssh2"))
+             (delete-file-recursively
+               (string-append "guix-vendor/rust-libz-sys-"
+                              ,(package-version rust-libz-sys-1.0)
+                              ".crate/src/zlib"))
+             (setenv "LIBSSH2_SYS_USE_PKG_CONFIG" "1")
+             #t)))))
+    (native-inputs
+     `(("libssh2" ,libssh2)
+       ("openssl" ,openssl)
+       ("pkg-config" ,pkg-config)
+       ("zlib" ,zlib)))
     (home-page "https://github.com/alexcrichton/ssh2-rs")
     (synopsis "Native bindings to the libssh2 library")
     (description
      "This package provides native rust bindings to the @code{libssh2} library.")
-    (properties '((hidden? . #t)))
     (license (list license:asl2.0
                    license:expat))))