meson: Use different STRACEDIR folder for intel_devinfo_override_test

Fixes
--- stderr ---
strace: Can't fopen 'meson-logs/strace/intel_device_info_override_test_120_/log.10613': No such file or directory

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Acked-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17928>

.gitlab-ci/meson/time-strace.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
-STRACEDIR=meson-logs/strace/$(for i in $@; do basename -z -- $i; echo -n _; done)
+if [ "x$STRACEDIR" = "x" ]; then
+    STRACEDIR=meson-logs/strace/$(for i in $@; do basename -z -- $i; echo -n _; done)
+fi
 
 mkdir -p $STRACEDIR