Update buildroot & docker (#25)

* Update docker & buildroot

* Fix

* fix versions

buildroot/package/libsepol/0002-workaround-blackfin-issue.patch

@@ -1,26 +0,0 @@
-Do not make symbols hidden on Blackfin
-
-The libselinux logic to hide internal symbols from the DSO doesn't
-work properly on Blackfin due to the USER_LABEL_PREFIX not being
-handled properly. A real fix is not that simple, so this patch simply
-disables the internal symbol hiding mechanism. This means that those
-symbols are visible in the final DSO, which is not a problem for
-proper execution, it just isn't as clean.
-
-Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
-Signed-off-by: Adam Duskett <Aduskett@gmail.com>
-
-Index: b/src/dso.h
-===================================================================
---- a/src/dso.h
-+++ b/src/dso.h
-@@ -5,7 +5,7 @@
-     #define DISABLE_SYMVER 1
- #endif
- 
--#ifdef SHARED
-+#if defined(SHARED) && !defined(__bfin__)
- # define hidden __attribute__ ((visibility ("hidden")))
- # define hidden_proto(fct) __hidden_proto (fct, fct##_internal)
- # define __hidden_proto(fct, internal)	\
-