meson: Replace configure_file with fs.copyfile

configure_file is deprecated since 0.64.0, and replace it with
fs.copyfile.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I776a96a47c35121b3ba88e3e3387fc70b84d93dd
diff --git a/meson.build b/meson.build
index 9e0421e..0cfd2b4 100644
--- a/meson.build
+++ b/meson.build
@@ -53,10 +53,9 @@
     'systemdsystemunitdir',
     pkgconfig_define: ['prefix', get_option('prefix')])
 
-configure_file(
-    copy: true,
-    input: 'srvcfg-manager.service',
+fs = import('fs')
+fs.copyfile(
+    'srvcfg-manager.service',
     install: true,
-    install_dir: systemd_system_unit_dir,
-    output: 'srvcfg-manager.service'
+    install_dir: systemd_system_unit_dir
 )