[master] c5ed00b63 circleci: Double quote CFLAGS in the bionic job

[Dridi Boukelmoune]

commit c5ed00b63c9ceb0af1d244f2e90878bfd73afd12
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Mon Sep 20 11:13:14 2021 +0200

    circleci: Double quote CFLAGS in the bionic job
    
    Otherwise they interfere with the surrounding sh -c '...' command.

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1b4a24342..2cb0c96de 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -365,7 +365,7 @@ workflows:
           name: distcheck_ubuntu_bionic
           dist: ubuntu
           release: bionic
-          extra_conf: CFLAGS='-g -O2 -m32'
+          extra_conf: CFLAGS="-g -O2 -m32"
       - distcheck:
           name: distcheck_alpine
           dist: alpine