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

commit: https://git.buildroot.net/buildroot/commit/?id=29f88337be38918a1c2864079777e56c86561231
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.05.x

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

In file included from details/shared-ptr/base.cxx:5:
../odb/details/shared-ptr/base.hxx:38:49: error: ISO C++17 does not allow dynamic exception specifications
   38 | operator new (std::size_t, odb::details::share) throw (std::bad_alloc);
      |                                                 ^~~~~

Fixes:
 - http://autobuild.buildroot.org/results/cfd5f92f0aa923815edba5fbfcd5b7b312d9d40e

Signed-off-by: Fabrice Fontaine <redacted>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <redacted>
(cherry picked from commit 69d2d1d91e44d6bc80690b82811d0447e81ed31b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/libodb/libodb.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/package/libodb/libodb.mk b/package/libodb/libodb.mk
index f36d8957c0..11ca9de866 100644
--- a/package/libodb/libodb.mk
+++ b/package/libodb/libodb.mk

@@ -11,5 +11,6 @@ LIBODB_SITE = https://www.codesynthesis.com/download/odb/$(LIBODB_VERSION_MAJOR)
 LIBODB_INSTALL_STAGING = YES
 LIBODB_LICENSE = GPL-2.0
 LIBODB_LICENSE_FILES = LICENSE
+LIBODB_CONF_ENV = CXXFLAGS="$(TARGET_CXXFLAGS) -std=c++11"
 
 $(eval $(autotools-package))

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