Bump buidlroot version to 2018.02.6

bsp/buildroot/package/gqrx/0001-fix_compilation_in_gcc-6.patch

@@ -0,0 +1,34 @@
+From e6baaee4968345a53e977f593362267a91041cff Mon Sep 17 00:00:00 2001
+From: Valentin Ochs <a@0au.de>
+Date: Fri, 21 Oct 2016 20:12:50 +0200
+Subject: [PATCH] Cosmetic & readability changes
+
+Backport patch from
+https://github.com/csete/gqrx/commit/e6baaee4968345a53e977f593362267a91041cff
+
+Fix compilation in gcc-6
+
+Signed-off-by: Valentin Ochs <a@0au.de>
+Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+---
+diff --git a/src/qtgui/plotter.cpp b/src/qtgui/plotter.cpp
+index e491632..b877546 100644
+--- a/src/qtgui/plotter.cpp
++++ b/src/qtgui/plotter.cpp
+@@ -1336,8 +1336,11 @@ void CPlotter::drawOverlay()
+ #endif
+ 
+             int level = 0;
+-            for (; level < nLevels && tagEnd[level] > x; level++);
+-                level %= nLevels;
++            while(level < nLevels && tagEnd[level] > x)
++                level++;
++            
++            if(level == nLevels)
++                level = 0;
+ 
+             tagEnd[level] = x + nameWidth + slant - 1;
+             m_BookmarkTags.append(qMakePair<QRect, qint64>(QRect(x, level * levelHeight, nameWidth + slant, fontHeight), bookmarks[i].frequency));
+-- 
+2.10.2
+