games/aquaria: unbreak build with Clang 6 (C++14 by default)

Aquaria/ScriptInterface.cpp:10412:59: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wreserved-user-defined-literal]
#define MK_ALIAS(prefix, suffix, alias) {MK_STR(prefix)"_"MK_STR(alias), l_prefix_##suffix},

^

Reported by: antoine (via bug 224669)