meson: Multi-lines string should use ''' with meson (systemd#8225)

jeandet · yuwata · commit 12873b6c80c9 · 2018-02-20T10:36:41.000+09:00
This breaks with latest version of meson: https://hephaistos.lpp.polytechnique.fr/teamcity/viewLog.html?buildId=11653&buildTypeId=mesonbuild_SystemdNightly&tab=buildLog&state=1059#_state=1059&guest=true
diff --git a/src/journal/meson.build b/src/journal/meson.build
@@ -131,8 +131,8 @@ meson.add_install_script(
         mkdir_p.format('/var/log/journal'))
 meson.add_install_script(
         'sh', '-c',
-        'chown 0:0 $DESTDIR/var/log/journal &&
-         chmod 755 $DESTDIR/var/log/journal || :')
+        '''chown 0:0 $DESTDIR/var/log/journal &&
+         chmod 755 $DESTDIR/var/log/journal || :''')
 if get_option('adm-group')
         meson.add_install_script(
                 'sh', '-c',
