mingw-w64-llvm: update to 19.1.3

[gitforwindowshelper]

This closes git-for-windows/git#5254

[dscho]

From the log:

==> ERROR: 0201-compiler-rt-fix-mingw-compile-error.patch was not found in the build directory and is not a URL.

I see that this file name was added to the sources, but I do not see that the file itself was added. Maybe a glitch in the update script?

[rimrul]

I think we fail to git add the patch files.