gnu: curl: Update replacement to 7.60.0 [Fixes CVE-2018-{1000300,1000301}].

* gnu/packages/curl.scm (curl)[replacement]: Update to 7.60.0.
(curl-7.59.0): Replace with ...
(curl-7.60.0): ... new variable.

gnu/packages/curl.scm

@@ -50,7 +50,7 @@
   (package
    (name "curl")
    (version "7.57.0")
-   (replacement curl-7.59.0)
+   (replacement curl-7.60.0)
    (source (origin
             (method url-fetch)
             (uri (string-append "https://curl.haxx.se/download/curl-"
@@ -139,10 +139,10 @@ tunneling, and so on.")
                                   "See COPYING in the distribution."))
    (home-page "https://curl.haxx.se/")))
 
-(define-public curl-7.59.0
+(define-public curl-7.60.0
   (package
     (inherit curl)
-    (version "7.59.0")
+    (version "7.60.0")
     (source
       (origin
         (method url-fetch)
@@ -150,7 +150,7 @@ tunneling, and so on.")
                             version ".tar.xz"))
         (sha256
          (base32
-          "1z310hrjm2vmbcpkyp81dcmj9rk127zkjyawpy2pah0nz6yslkp4"))))))
+          "1876ck0smbqz3xakm7s6q6gh4zarh9pv3izf4vlzgpc9xn6zydl7"))))))
 
 (define-public kurly
   (package