[Buildroot] [git commit branch/2021.05.x] package/ibrcommon: fix build with gcc 11

commit: https://git.buildroot.net/buildroot/commit/?id=ee8b84a72f8523d9e8ea484d4180818124293993
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.05.x

Fix the following build failure with gcc 11:

In file included from ../../ibrcommon/data/BLOB.h:25,
                 from BLOB.cpp:22:
../../ibrcommon/thread/Mutex.h:43:40: error: ISO C++17 does not allow dynamic exception specifications
   43 |                 virtual void trylock() throw (MutexException) = 0;
      |                                        ^~~~~

Fixes:
 - http://autobuild.buildroot.org/results/7a9a4319916efe8cd7e04b8686a9ae0b233b017a

Signed-off-by: Fabrice Fontaine <redacted>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 867e7a040ce1907cdc74d2040845ef155ede57d1)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/ibrcommon/ibrcommon.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/ibrcommon/ibrcommon.mk b/package/ibrcommon/ibrcommon.mk
index 4d2d351c88..d9e843ebc2 100644
--- a/package/ibrcommon/ibrcommon.mk
+++ b/package/ibrcommon/ibrcommon.mk

@@ -10,6 +10,7 @@ IBRCOMMON_INSTALL_STAGING = YES
 IBRCOMMON_LICENSE = Apache-2.0
 IBRCOMMON_LICENSE_FILES = COPYING README
 IBRCOMMON_DEPENDENCIES = host-pkgconf
+IBRCOMMON_CONF_ENV = CXXFLAGS="$(TARGET_CXXFLAGS) -std=c++11"
 
 ifeq ($(BR2_PACKAGE_OPENSSL),y)
 IBRCOMMON_DEPENDENCIES += openssl

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