test-network: replace symlink to 99-default.link with a copy

Then, we can drop ugly workaround in meson.build.
The .link file is not necessarily synced with 99-default.link.
Also, 99-default.link is not updated so frequently.
Let's manually sync it when necessary.

test/meson.build

@@ -479,22 +479,17 @@ if install_tests
                                 error('rsync is required to install the integration test data')
                         endif
 
-                        rsync_r = rsync.full_path() + ' -rlpt --exclude .gitattributes --exclude 25-default.link -- "@0@" "${DESTDIR:-}@1@"'
+                        rsync_r = rsync.full_path() + ' -rlpt --exclude .gitattributes -- "@0@" "${DESTDIR:-}@1@"'
                         meson.add_install_script(sh, '-c',
                                                  rsync_r.format(meson.current_source_dir() / subdir, testdata_dir))
                 else
                         install_subdir(subdir,
-                                       exclude_files : ['.gitattributes', '25-default.link'],
+                                       exclude_files : ['.gitattributes'],
                                        install_dir : testdata_dir,
                                        follow_symlinks : false)
                 endif
         endforeach
 
-        # test-network/conf/25-default.link is a local symlink that becomes dangling when installed, so we
-        # exclude it and create the correct symlink here.
-        meson.add_install_script(sh, '-c', ln_s.format(networkdir / '99-default.link',
-                                                       testdata_dir / 'test-network/conf/25-default.link'))
-
         install_data(kbd_model_map,
                      install_dir : testdata_dir + '/test-keymap-util')
 

test/test-network/conf/25-default.link

@@ -1 +0,0 @@
-../../../network/99-default.link

test/test-network/conf/25-default.link

@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: MIT-0
+#
+# This is a copy of 99-default.link.
+
+[Match]
+OriginalName=*
+
+[Link]
+NamePolicy=keep kernel database onboard slot path
+AlternativeNamesPolicy=database onboard slot path mac
+MACAddressPolicy=persistent