gnu: lcov: Update to 1.15.

* gnu/packages/code.scm (lcov): Update to 1.15.
[source]: Use a release tarball.
[inputs]: Replace perl-perlio-gzip with perl-io-compress.

gnu/packages/code.scm

@@ -470,24 +470,17 @@ stack traces.")
     (license license:gpl3+)))
 
 (define-public lcov
-  ;; Use a recent commit from upstream since the latest official release
-  ;; (1.14) doesn't support GCC 9 (see:
-  ;; https://github.com/linux-test-project/lcov/issues/58).
-  (let* ((commit "40580cd65909bc8324ae09b36bca2e178652ff3f")
-         (revision "0")
-         (version (git-version "1.14" revision commit)))
   (package
     (name "lcov")
-      (version "1.14")
+    (version "1.15")
-      (source (origin
+    (source
-                (method git-fetch)
+     (origin
-                (uri (git-reference
+       (method url-fetch)
-                      (url "https://github.com/linux-test-project/lcov")
+       (uri (string-append "https://github.com/linux-test-project/lcov"
-                      (commit commit)))
+                           "/releases/download/v" version
-                (file-name (git-file-name name version))
+                           "/lcov-" version ".tar.gz"))
        (sha256
-                 (base32
+        (base32 "0fh5z0q5wg2jxr2nn5w7321y0zg9rwk75j3k5hnamjdy6gxa5kf1"))))
-                  "0shgmh6fzhnj1qfdl90jgjmlbb1ih1qh879dca8hc58yggy3hqgb"))))
     (build-system gnu-build-system)
     (arguments
      '(#:test-target "test"
@@ -513,8 +506,8 @@ stack traces.")
                  `("PERL5LIB" ":" prefix (,(getenv "PERL5LIB")))))
              #t)))))
     (inputs `(("perl" ,perl)
-                ("perl-json" ,perl-json)
+              ("perl-io-compress" ,perl-io-compress)
-                ("perl-perlio-gzip" ,perl-perlio-gzip)))
+              ("perl-json" ,perl-json)))
     (home-page "http://ltp.sourceforge.net/coverage/lcov.php")
     (synopsis "Code coverage tool that enhances GNU gcov")
     (description "LCOV is an extension of @command{gcov}, a tool part of the
@@ -523,7 +516,7 @@ are actually executed (i.e., \"covered\") while running a particular test
 case.  The extension consists of a set of Perl scripts which build on the
 textual @command{gcov} output to implement the following enhanced
 functionality such as HTML output.")
-      (license license:gpl2+))))
+    (license license:gpl2+)))
 
 (define-public kcov
   (package