Ensure Capstone is build for the architecture according to cibuildwheel

CMakeLists.txt

@@ -48,7 +48,28 @@ option(CAPSTONE_INSTALL "Generate install target" ${PROJECT_IS_TOP_LEVEL})
 
 # If building for OSX it's best to allow CMake to handle building both architectures
 if(APPLE AND NOT CAPSTONE_BUILD_MACOS_THIN)
-    set(CMAKE_OSX_ARCHITECTURES "x86_64;arm64")
+    # The cibuildwheel on Github Actions sets this env variable
+    # with the architecture flags it wants to build for.
+    if(DEFINED ENV{ARCHFLAGS})
+        if("$ENV{ARCHFLAGS}" STREQUAL "-arch arm64 -arch x86_64")
+            set(CMAKE_OSX_ARCHITECTURES "x86_64;arm64")
+        elseif("$ENV{ARCHFLAGS}" STREQUAL "-arch arm64")
+            set(CMAKE_OSX_ARCHITECTURES "arm64")
+        elseif("$ENV{ARCHFLAGS}" STREQUAL "-arch x86_64")
+            set(CMAKE_OSX_ARCHITECTURES "x86_64")
+        endif()
+    else()
+        set(CMAKE_OSX_ARCHITECTURES "x86_64;arm64")
+    endif()
+endif()
+
+if (DEFINED ENV{VSCMD_ARG_TGT_ARCH})
+    # The cibuildwheel on Github Actions sets this env variable
+    # with the architecture it wants to build for (for Windows).
+    # We need to handle the x86 case here.
+    if("$ENV{VSCMD_ARG_TGT_ARCH}" STREQUAL "x86")
+        set(CMAKE_GENERATOR_PLATFORM "Win32")
+    endif()
 endif()
 
 list(LENGTH SUPPORTED_ARCHITECTURES count)