gnu: Add rust-isahc-0.7.

* gnu/packages/crates-io.scm (rust-isahc-0.7): New variable.

gnu/packages/crates-io.scm

@@ -17241,6 +17241,39 @@ uses libcurl as an HTTP engine inside, and provides an easy-to-use API on top
 that integrates with Rust idioms.")
     (license license:expat)))
 
+(define-public rust-isahc-0.7
+  (package
+    (inherit rust-isahc-0.9)
+    (name "rust-isahc")
+    (version "0.7.6")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "isahc" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "1yy3v4r2i4hf0a436676cw4b2bnkb510gxvrldcswlrfy4kp1dqp"))))
+    (arguments
+     `(#:skip-build? #t
+       #:cargo-inputs
+       (("rust-bytes" ,rust-bytes-0.4)
+        ("rust-chrono" ,rust-chrono-0.4)
+        ("rust-crossbeam-channel" ,rust-crossbeam-channel-0.3)
+        ("rust-crossbeam-utils" ,rust-crossbeam-utils-0.6)
+        ("rust-curl" ,rust-curl-0.4)
+        ("rust-curl-sys" ,rust-curl-sys-0.4)
+        ("rust-futures-io-preview" ,rust-futures-io-preview-0.3)
+        ("rust-futures-util-preview" ,rust-futures-util-preview-0.3)
+        ("rust-http" ,rust-http-0.1)
+        ("rust-lazy-static" ,rust-lazy-static-1)
+        ("rust-log" ,rust-log-0.4)
+        ("rust-parking-lot" ,rust-parking-lot-0.9)
+        ("rust-publicsuffix" ,rust-publicsuffix-1)
+        ("rust-serde" ,rust-serde-1)
+        ("rust-serde-json" ,rust-serde-json-1)
+        ("rust-slab" ,rust-slab-0.4)
+        ("rust-sluice" ,rust-sluice-0.4))))))
+
 (define-public rust-ipnet-2
   (package
     (name "rust-ipnet")