Change up strcasecmp/strncasecmp to be more C++y

Quake/keys.cpp

@@ -535,7 +535,7 @@ int Key_StringToKeynum(const char *str) {
         return str[0];
 
     for (kn = keynames; kn->name; kn++) {
-        if (!q_strcasecmp(str, kn->name))
+        if (std::is_eq(common::strcasecmp(str, kn->name)))
             return kn->keynum;
     }
     return -1;