net-im/vacuum-im: Fix build with Clang 6

src/plugins/filemessagearchive/filemessagearchive.cpp:514:24: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wreserved-user-defined-literal]

QFile log(dirPath+"/"LOG_FILE_NAME);
                     ^

... and many more like these later

http://beefy11.nyi.freebsd.org/data/head-i386-default/p478648_s338416/logs/errors/vacuum-im-1.2.5.log