Small typo that wasted millions of instructions.

Now that #define CRENGINE_DEBUG is handled correctly, all those pesky
messages from crengine are gone and so the performance of crereader
should be much better --- remember that under some circumstances
crengine generates literally THOUSANDS of debug messages per second
(e.g. when complaining about corrupt TOC nodes and there are _plenty_ of
fb2 files out there which have an invalid structure).

cre.cpp

@@ -575,7 +575,7 @@ int luaopen_cre(lua_State *L) {
 	/* initialize font manager for CREngine */
 	InitFontManager(lString8());
 
-#ifdef DEBUG_CRENGINE
+#if DEBUG_CRENGINE
 	CRLog::setStdoutLogger();
 	CRLog::setLogLevel(CRLog::LL_DEBUG);
 #endif