cmake: disable ARM64 ASM on Windows

ARM64 ASM on Windows generates a lot of `-Wasm-operand-widths` compiler
warnings. It also seems to break bignum calculations, resulting in:
```
curl: (35) TLS connect error: error:04FFF077:rsa routines:CRYPTO_internal:wrong signature length
```
and other issues.

This option did not cause an issue with MSVC ARM64. The reason for this
is that the only ASM code for ARM64 is the bignum implementation
(crypto/bn/arch/aarch64) and that ASM code is guarded for `__GNUC__`,
meaning gcc and llvm/clang, and never MSVC or clang-cl.

Follow-up to 1df6b52b250f04cd322bf7a79e2105f9ed890802 #1177
Fixes #1210

1 files changed, 3 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index bede146..503ace3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -412,6 +412,9 @@ endif()
 
 if(CMAKE_SYSTEM_PROCESSOR MATCHES "(aarch64|arm64|ARM64)")
         set(HOST_AARCH64 true)
+        if(WIN32)
+                set(ENABLE_ASM false)
+        endif()
 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "arm")
         set(HOST_ARM true)
         if(APPLE)