Bump buildroot to 2019.02

bsp/buildroot/package/botan/0001-remove-mips64-explicit-mabi.patch

@@ -3,15 +3,17 @@ Remove explicit mips64 -mabi parameter
 This breaks when building for n32 ABI on mips64.
 
 Signed-off-by: Baruch Siach <baruch@tkos.co.il>
+[Bernd: rebased for botan-2.7.0]
+Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
 ---
 
 diff -Nuar Botan-1.10.8-orig/src/build-data/cc/gcc.txt Botan-1.10.8/src/build-data/cc/gcc.txt
 --- Botan-1.10.8-orig/src/build-data/cc/gcc.txt	2014-04-10 17:11:44.000000000 +0300
 +++ Botan-1.10.8/src/build-data/cc/gcc.txt	2014-10-23 09:20:34.506722323 +0300
-@@ -92,7 +92,6 @@
- # The 'linking' bit means "use this for both compiling *and* linking"
- <mach_abi_linking>
- x86_64  -> "-m64"
+@@ -83,7 +83,6 @@
+ 
+ openmp  -> "-fopenmp"
+ 
 -mips64  -> "-mabi=64"
  s390    -> "-m31"
  s390x   -> "-m64"