bluez4: Fix encrypt symbol namespace collision

bluez4: Fix encrypt symbol namespace collision

| Makefile:3352: recipe for target 'test/l2test.o' failed
| make[1]: *** [test/l2test.o] Error 1
| make[1]: *** Waiting for unfinished jobs....
| test/rctest.c:82:12: error: 'encrypt' redeclared as different kind of
symbol
|  static int encrypt = 0;
|             ^
| In file included from test/rctest.c:33:0:

Change-Id: Iaf2f644ef3cef6f96c6e4bc421c9e78a0e23e674
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>