remove linux header files that have case conflicts
similar commit from the past:
c73cd05468fba4bba5762a654aacdd9d90ecd272
This also modifies tools/update-linux-headers.zig to remove these same
files for next time to prevent a regression.
closes #10249
8635275202Andrew Kelley committed on 11/30/2021, 9:29:11 PMparent51df63a