winbuild: document that arm64 is supported

Building an arm64 version works flawlessly with the VS arm64 toolset.

Closes https://github.com/curl/curl/pull/10332

diff --git a/winbuild/README.md b/winbuild/README.md
index 33a6448630098efb2bccd24ef4a7f1f4f308c61e..1ecde7cee7492927a805d006d3c4c3971cc6c72a 100644 (file)
--- a/winbuild/README.md
+++ b/winbuild/README.md
@@ -104,7 +104,7 @@ where `<options>` is one or many of:
  - `GEN_PDB=<yes/no>`            - Generate External Program Database\r
                                    (debug symbols for release build)\r
  - `DEBUG=<yes/no>`              - Debug builds\r
- - `MACHINE=<x86/x64>`           - Target architecture (default is x86)\r
+ - `MACHINE=<x86/x64/arm64>`     - Target architecture (default is x86)\r
  - `CARES_PATH=<path>`           - Custom path for c-ares\r
  - `MBEDTLS_PATH=<path>`         - Custom path for mbedTLS\r
  - `NGHTTP2_PATH=<path>`         - Custom path for nghttp2\r