gnu: libgit2: Update to 1.3.0.

* gnu/packages/patches/libgit2-mtime-0.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): De-register it.
* gnu/packages/version-control.scm (libgit2): Update to 1.3.0.
[source]: Remove patch and simplify snippet.
[phases]: Remove trailing #t.

gnu/local.mk

@@ -1347,7 +1347,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/libcyaml-libyaml-compat.patch		\
   %D%/packages/patches/libexpected-nofetch.patch                \
   %D%/packages/patches/libgeotiff-adapt-test-script-for-proj-6.2.patch		\
-  %D%/packages/patches/libgit2-mtime-0.patch			\
   %D%/packages/patches/libgnome-encoding.patch			\
   %D%/packages/patches/libgnomeui-utf8.patch			\
   %D%/packages/patches/libgrss-CVE-2016-2001.patch		\

gnu/packages/patches/libgit2-mtime-0.patch

@@ -1,14 +0,0 @@
-The Clar test framework has a bug whereby it skips the parsing phase
-on files with mtime=0.
-
-Reported upstream at <https://github.com/vmg/clar/pull/78>.
-
-diff --git a/tests/generate.py b/tests/generate.py
-index b639c8f..111ca41 100644
---- a/tests/generate.py
-+++ b/tests/generate.py
-@@ -63,3 +63,3 @@ class Module(object):
- 
--        self.mtime = 0
-+        self.mtime = None # Guix sets all file mtimes to '0'
-         self.enabled = True

gnu/packages/version-control.scm

@@ -786,19 +786,20 @@ to GitHub contributions calendar.")
 (define-public libgit2
   (package
     (name "libgit2")
-    (version "1.1.0")
+    (version "1.3.0")
     (source (origin
-              (method url-fetch)
-              (uri (string-append "https://github.com/libgit2/libgit2/"
-                                  "releases/download/v" version
-                                  "/libgit2-" version ".tar.gz"))
+              ;; Since v1.1.1, release artifacts are no longer offered (see:
+              ;; https://github.com/libgit2/libgit2/discussions/5932#discussioncomment-1682729).
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/libgit2/libgit2")
+                    (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
               (sha256
                (base32
-                "1fjdglkh04qv3b4alg621pxa689i0wlf8m7nf2755zawjr2zhwxd"))
-              (patches (search-patches "libgit2-mtime-0.patch"))
-              (snippet '(begin
-                          (delete-file-recursively "deps") #t))
-              (modules '((guix build utils)))))
+                "0vgpb2175a5dhqiy1iwywwppahgqhi340i8bsvafjpvkw284vazd"))
+              (modules '((guix build utils)))
+              (snippet '(delete-file-recursively "deps"))))
     (build-system cmake-build-system)
     (outputs '("out" "debug"))
     (arguments
@@ -820,8 +821,7 @@ to GitHub contributions calendar.")
                (("#!/bin/sh") (string-append "#!" (which "sh"))))
              (substitute* "tests/clar/fs.h"
                (("/bin/cp") (which "cp"))
-               (("/bin/rm") (which "rm")))
-             #t))
+               (("/bin/rm") (which "rm")))))
          ;; Run checks more verbosely, unless we are cross-compiling.
          (replace 'check
            (lambda* (#:key (tests? #t) #:allow-other-keys)