[PATCH] gitlab-ci: Test building linux-user targets on CentOS 7

[Philippe Mathieu-Daudé]

Add a configuration tested by Peter Maydell (see [1] and [2])
but not covered in our CI [3]:

  [705/2910] Compiling C object 
libqemu-arm-linux-user.fa.p/linux-user_strace.c.o
  FAILED: libqemu-arm-linux-user.fa.p/linux-user_strace.c.o
  ../linux-user/strace.c: In function 'do_print_sockopt':
  ../linux-user/strace.c:2831:14: error: 'IPV6_ADDR_PREFERENCES' undeclared 
(first use in this function)
           case IPV6_ADDR_PREFERENCES:
                ^

[1] https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg05086.html
[2] https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg05379.html
[3] https://gitlab.com/philmd/qemu/-/jobs/977408284:

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 .gitlab-ci.yml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 203b1671c43..ce52d6cb2cb 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -378,6 +378,13 @@ build-user-plugins:
     MAKE_CHECK_ARGS: check-tcg
   timeout: 1h 30m
 
+build-user-centos7:
+  <<: *native_build_job_definition
+  variables:
+    IMAGE: centos7
+    CONFIGURE_ARGS: --disable-system --disable-tools --disable-docs
+    MAKE_CHECK_ARGS: check-tcg
+
 build-some-softmmu-plugins:
   <<: *native_build_job_definition
   variables:
-- 
2.26.2