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

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=96b35a7f214d34502bcd00b4e7f189965fee4ee7
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.02.x

Fixes:
http://autobuild.buildroot.net/results/8f0/8f0e3b604ff9809e3b415036b8d99521db33c4db
http://autobuild.buildroot.net/results/d03/d038b79e719c37a93d635c6b61443033094d8716

Signed-off-by: Fabrice Fontaine <fontaine.fabrice at gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
(cherry picked from commit 506bace2fe1f1236b9888f4cc7bd32d1c81760f0)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/libodb-mysql/libodb-mysql.mk | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/libodb-mysql/libodb-mysql.mk b/package/libodb-mysql/libodb-mysql.mk
index a9040c65f8..88b6f4cb31 100644
--- a/package/libodb-mysql/libodb-mysql.mk
+++ b/package/libodb-mysql/libodb-mysql.mk
@@ -12,6 +12,8 @@ LIBODB_MYSQL_INSTALL_STAGING = YES
 LIBODB_MYSQL_LICENSE = GPL-2.0
 LIBODB_MYSQL_LICENSE_FILES = LICENSE
 LIBODB_MYSQL_DEPENDENCIES = libodb mysql
-LIBODB_MYSQL_CONF_ENV = LIBS=`$(STAGING_DIR)/usr/bin/mysql_config --libs`
+LIBODB_MYSQL_CONF_ENV = \
+	CXXFLAGS="$(TARGET_CXXFLAGS) -std=c++11" \
+	LIBS=`$(STAGING_DIR)/usr/bin/mysql_config --libs`
 
 $(eval $(autotools-package))