Enable Windows Arm64 support

setup.py

@@ -12,8 +12,13 @@
     # _find_library('sndfile') fails:
     if sys.platform == 'win32':
         architecture0 = architecture()[0]  # 64bit or 32bit
+        if architecture0 == '64bit':
+            if 'arm' in machine().lower():
+                architecture0 = 'arm64'
+            else:
+                architecture0 = 'x64'
     else:
-        architecture0 = machine()  # x86_64 or arm64
+        architecture0 = machine()
 
 if platform == 'darwin':
     libname = 'libsndfile_' + architecture0 + '.dylib'

soundfile.py

@@ -158,12 +158,11 @@
     elif _sys.platform == 'win32':
         from platform import architecture as _architecture
         from platform import machine as _machine
-        # this check can not be completed correctly: for x64 binaries running on
-        # arm64 Windows report the same values as arm64 binaries. For now, neither
-        # numpy nor cffi are available for arm64, so we can safely assume we're
-        # in x86 land:
         if _architecture()[0] == '64bit':
-            _packaged_libname = 'libsndfile_x64.dll'
+            if _machine().lower() == 'arm64':
+                _packaged_libname = 'libsndfile_arm64.dll'  
+            else:     
+                _packaged_libname = 'libsndfile_x64.dll'
         elif _architecture()[0] == '32bit':
             _packaged_libname = 'libsndfile_x86.dll'
         else: