Test: clang 21.1.1-2

The following packages have been uploaded to the Cygwin distribution:

* clang-21.1.1-2
* libclang21.1-21.1.1-2
* libclang-devel-21.1.1-2
* clang-doc-21.1.1-2
* mingw64-i686-clang-21.1.1-2
* mingw64-x86_64-clang-21.1.1-2
* clang-analyzer-21.1.1-2
* git-clang-format-21.1.1-2

Clang is an LLVM native C/C++/ObjC compiler, which aims to deliver
amazingly fast compiles, extremely useful error and warning messages and
to provide a platform for building great source level tools. The Clang
Static Analyzer is a tool that automatically finds bugs in your code, and
is a great example of the sort of tool that can be built using the Clang
frontend as a library to parse C/C++ code.

This version fixes Cygwin linker flags (--nxcompat, --large-address-aware
for 32-bit target, and only passing --disable-high-entropy-va for 64-bit
targets), no longer warning about stdcall/fastcall/thiscall on x86_64
Cygwin (even though they are no-ops), and re-enabling Microsoft-style
calling convention name mangling for Cygwin (such as stdcall Name@N)
(which was a regression from 20.x).  I believe the only such name mangling
in effect on x86_64 is "vectorcall".
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