[PATCH] tests/tcg: Fix building outside of the source tree

[Ilya Leoshkevich <iii@linux.ibm.com>]

Running TCG tests from a build directory that is outside of the source
tree fails with:

    [...]/qemu/tests/tcg/multiarch/libs/float_helpers.c:228:1: fatal error: opening dependency file tests/tcg/s390x-linux-user-float_convs.d: No such file or directory

This is because the build directory is not mounted into the container.
Add this mount. Do not bother with preventing overlapping mounts, they
are harmless.

Fixes: 27939ad414ca ("tests/tcg/meson.build: introduce cc_dockerfile and cc_docker_host_arch")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 tests/tcg/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/tcg/meson.build b/tests/tcg/meson.build
index d41a228fb3d..cae64efb06c 100644
--- a/tests/tcg/meson.build
+++ b/tests/tcg/meson.build
@@ -269,7 +269,7 @@ foreach target, plan: tcg_tests
       mount = mount + ':' + mount
       here = meson.project_build_root()
       cc = [docker_wrapper, 'run', '--run-as-current-user',
-            '-w', here, '-v', mount,
+            '-w', here, '-v', here + ':' + here, '-v', mount,
             cc_dockerfile, plan['cc']]
       has_cc = true
     endif
-- 
2.55.0