runtime: deduplicate Windows stdcall

There is no need to have a dedicated stdcall variant for each
number of arguments. Instead, we can use a variadic function
that accepts any number of arguments and handles them uniformly.

While here, improve documentation of syscall_syscalln to make it clear
that it should not be used within the runtime package.

Change-Id: I022afc7f28d969fd7307bb2b1f4594246ac38d18
Reviewed-on: https://go-review.googlesource.com/c/go/+/691215
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Mark Freeman <mark@golang.org>
8 files changed
tree: 30145c1a275b5d5003edb3f9d701d0c90996da20
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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