Disable new dangerous check introduced in several previous commits

It seems that it does not provide anything useful while, say, Klever can
fail with unclear errors due to it (it is another story why these errors
are unclear).

cif.c

@@ -1000,10 +1000,13 @@ static char *concat(const char *first, ...)
 
     /* Indeed, this function is used in different places, not only to concatenate directory and file names, but anyway
        its result should be pretty limited. */
+    /* This check seems to be to dangerous. Anyway, later something should fail if the concatenated string will be
+       inappropriate.
     if (length >= PATH_MAX) {
         fprintf(stderr, "Too long concatenated string.\n");
         exit(-1);
     }
+    */
 
     /* Allocate enough memory to store resulted string. */
     res = malloc(length + 1);