Apply a52f8a59aef46b59753e583bf4b28fccb069ce64 to 5.15 through 4.19

Hi Greg and Sasha,

There is a build error with newer versions of clang due to a broken FORTIFY_SOURCE implementation, which has never worked:

https://github.com/ClangBuiltLinux/linux/issues/1496 https://github.com/ClangBuiltLinux/continuous-integration2/actions/runs/1457...

Please apply upstream commit a52f8a59aef4 ("fortify: Explicitly disable Clang support") to 5.15 through 4.19 to resolve this. It should apply cleanly.

Cheers, Nathan