[Buildroot] [git commit branch/2021.02.x] package/libjson: fix build with gcc 11

commit: https://git.buildroot.net/buildroot/commit/?id=02e2100e8ee82a85eec69292898c3f7cc64d5030
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.02.x

GCC 11 defaults to C++17. Fix the following build failure with gcc 11:

In file included from _internal/Source/JSONDefs.h:12,
                 from _internal/Source/JSONDebug.h:4,
                 from _internal/Source/JSONNode.h:4,
                 from _internal/Source/JSONNode.cpp:1:
_internal/Source/JSONDefs/GNU_C.h:58:28: error: ISO C++17 does not allow dynamic exception specifications
   58 |     #define json_throws(x) throw(x)
      |                            ^~~~~

Fixes:
 - http://autobuild.buildroot.org/results/1e66dff705bbb38e7e0f0e5864ce794b4345dcc6

Signed-off-by: Fabrice Fontaine <redacted>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <redacted>
(cherry picked from commit ff55c323af59bcaee3af949fd126bbec1889d1b2)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/libjson/libjson.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/libjson/libjson.mk b/package/libjson/libjson.mk
index d04ddc40f3..73268c9ccf 100644
--- a/package/libjson/libjson.mk
+++ b/package/libjson/libjson.mk

@@ -11,7 +11,7 @@ LIBJSON_INSTALL_STAGING = YES
 LIBJSON_LICENSE = BSD-2-Clause
 LIBJSON_LICENSE_FILES = License.txt
 
-LIBJSON_CXXFLAGS = $(TARGET_CFLAGS) -DNDEBUG
+LIBJSON_CXXFLAGS = $(TARGET_CFLAGS) -DNDEBUG -std=c++11
 
 ifeq ($(BR2_STATIC_LIBS),y)
 LIBJSON_MAKE_OPTS += SHARED=0

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