[libc++] Remove non-existent LWG issue from the .csv files

We can only track existing LWG issues because we need a valid LWG issue
number for all issues. I'll create another GH issue to track creating
that LWG issue instead.

Author: ldionne

libcxx/docs/Status/Cxx2cIssues.csv

@@ -76,6 +76,5 @@
 "`LWG4105 <https://wg21.link/LWG4105>`__","``ranges::ends_with``\`s Returns misses difference casting","2024-06 (St. Louis)","","","|ranges|"
 "`LWG4106 <https://wg21.link/LWG4106>`__","``basic_format_args`` should not be default-constructible","2024-06 (St. Louis)","|Complete|","19.0","|format|"
 "","","","","",""
-"`LWG3343 <https://wg21.link/LWG3343>`__","Ordering of calls to ``unlock()`` and ``notify_all()`` in Effects element of ``notify_all_at_thread_exit()`` should be reversed","Not Yet Adopted","|Complete|","16.0",""
-"XXXX","The sys_info range should be affected by save","Not Yet Adopted","|Complete|","19.0",""
+"`LWG3343 <https://wg21.link/LWG3343>`__","Ordering of calls to ``unlock()`` and ``notify_all()`` in Effects element of ``notify_all_at_thread_exit()`` should be reversed","Not Adopted Yet","|Complete|","16.0",""
 "","","","","",""