Bump buidlroot version to 2018.02.6

bsp/buildroot/package/libmpeg2/0004-fix-sparc.patch

@@ -0,0 +1,16 @@
+Do not use sparcv9 optimization flags for sparcv8 builds
+
+Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
+
+diff -Nur libmpeg2-0.5.1.orig/configure.ac libmpeg2-0.5.1/configure.ac
+--- libmpeg2-0.5.1.orig/configure.ac	2008-07-18 16:30:17.000000000 +0200
++++ libmpeg2-0.5.1/configure.ac	2017-04-26 21:09:15.780838339 +0200
+@@ -95,7 +95,7 @@
+ 		break
+ 	    fi
+ 	done;;
+-    sparc-* | sparc64-*)
++    sparc64-*)
+ 	AC_DEFINE([ARCH_SPARC],,[sparc architecture])
+ 	TRY_CFLAGS="$OPT_CFLAGS -mcpu=ultrasparc -mvis"
+ 	AC_TRY_CFLAGS([$TRY_CFLAGS $CFLAGS],[OPT_CFLAGS="$TRY_CFLAGS"]);;

bsp/buildroot/package/libmpeg2/libmpeg2.mk

@@ -6,7 +6,7 @@
 
 LIBMPEG2_VERSION = 0.5.1
 LIBMPEG2_SITE = http://libmpeg2.sourceforge.net/files
-LIBMPEG2_LICENSE = GPLv2+
+LIBMPEG2_LICENSE = GPL-2.0+
 LIBMPEG2_LICENSE_FILES = COPYING
 LIBMPEG2_INSTALL_STAGING = YES
 LIBMPEG2_AUTORECONF = YES