[BusyBox] loop.c broken since r10901

[Paul Fox]

 > 
 > Hello list,
 > 
 > revision 10901 introduced an ifdef that contains all code in
 > "libbb/loop.c".  As
 > 
 > 	#ifdef CONFIG_FEATURE_MOUNT_LOOP
 > 
 > is the first non-comment line there is no chance for
 > CONFIG_FEATURE_MOUNT_LOOP to be defined.
 > 
 > Please consider to add "#include <libbb.h>" before the #ifdef.

or, move the ifdef after the already-present include line.
commited in 10933.  this is the quick fix, possibly the right
fix, but it sounds like rob will turn it upside down soon
anyway...

paul
=---------------------
 paul fox, pgf at brightstareng.com