Support Windows/ARM64

Git for Windows has started building artifacts for Windows/ARM64 since v2.47.1 (November 25th 2024). Now that Windows/ARM64 GitHub Action runners are available in public preview
[https://github.blog/changelog/2025-04-14-windows-arm64-hosted-runners-now-available-in-public-preview/]
at long last, it is high time to upstream the minimal set of patches to build Git on Windows/ARM64 and pass the test suite.

Changes since v1:

* Replaced an #else #if construct by an #elif one.

Dennis Ameling (2):
bswap.h: add support for built-in bswap functions config.mak.uname: add support for clangarm64

Johannes Schindelin (4):
mingw: do not use nedmalloc on Windows/ARM64
msvc: do handle builds on Windows/ARM64 mingw(arm64): do move the /etc/git* location
max_tree_depth: lower it for clangarm64 on Windows

 compat/bswap.h   | 14 +++++++++++++-
 config.mak.uname | 18 ++++++++++++++----
 environment.c    | 10 ++++++++++
 3 files changed, 37 insertions(+), 5 deletions(-)

base-commit: 683c54c999c301c2cd6f715c411407c413b1d84e
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1904%2Fdscho%2Fsupport-clangarm64-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1904/dscho/support-clangarm64-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/1904

Range-diff vs v1:

 1:  b89f39cbac6 = 1:  b89f39cbac6 bswap.h: add support for built-in bswap functions
 2:  2feeadb0d3f = 2:  2feeadb0d3f config.mak.uname: add support for clangarm64
 3:  6c2e17eca68 = 3:  6c2e17eca68 mingw: do not use nedmalloc on Windows/ARM64
 4:  c89ead8eaba = 4:  c89ead8eaba msvc: do handle builds on Windows/ARM64
 5:  939bcb0dc63 = 5:  939bcb0dc63 mingw(arm64): do move the `/etc/git*` location
 6:  6ebc3ef57fd ! 6:  e0e78bd5131 max_tree_depth: lower it for clangarm64 on Windows
     @@ environment.c: int max_allowed_tree_depth =
       	 * the stack overflow can occur.
       	 */
       	512;
     -+#else
     -+#if defined(GIT_WINDOWS_NATIVE) && defined(__clang__) && defined(__aarch64__)
     ++#elif defined(GIT_WINDOWS_NATIVE) && defined(__clang__) && defined(__aarch64__)
      +	/*
      +	 * Similar to Visual C, it seems that on Windows/ARM64 the clang-based
      +	 * builds have a smaller stack space available. When running out of
     @@ environment.c: int max_allowed_tree_depth =
       #else
       	2048;
       #endif
     -+#endif
     - 
     - #ifndef PROTECT_HFS_DEFAULT
     - #define PROTECT_HFS_DEFAULT 0

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