Wg fix (#172)

Build fix for iOS

client/cmake/ios-arch-fixup.cmake

@@ -0,0 +1,43 @@
+if(NOT XCODE)
+    return()
+endif()
+
+## Enumerate all the targets in the project
+get_directory_property(IOS_SUBDIRS SUBDIRECTORIES)
+get_directory_property(IOS_TARGETS BUILDSYSTEM_TARGETS)
+while(IOS_SUBDIRS)
+    list(POP_FRONT IOS_SUBDIRS SUBDIR)
+
+    get_directory_property(SUBDIR_TARGETS DIRECTORY ${SUBDIR} BUILDSYSTEM_TARGETS)
+    list(APPEND IOS_TARGETS ${SUBDIR_TARGETS})
+
+    get_directory_property(SUBDIR_NESTED DIRECTORY ${SUBDIR} SUBDIRECTORIES)
+    list(APPEND IOS_SUBDIRS ${SUBDIR_NESTED})
+endwhile()
+
+## The set of target types that we want to modify.
+set(IOS_TARGET_COMPILED_TYPES
+    STATIC_LIBRARY
+    MODULE_LIBRARY
+    SHARED_LIBRARY
+    OBJECT_LIBRARY
+    EXECUTABLE
+)
+
+## Inspect all the targets, and add extra properties if necessary.
+while(IOS_TARGETS)
+    list(POP_FRONT IOS_TARGETS TARGET_NAME)
+
+    get_target_property(TARGET_TYPE ${TARGET_NAME} TYPE)
+    list(FIND IOS_TARGET_COMPILED_TYPES ${TARGET_TYPE} IOS_TARGET_TYPE_INDEX)
+    if(IOS_TARGET_TYPE_INDEX LESS 0)
+        continue()
+    endif()
+
+    ## I just want to say it's amazing this doesn't explode with syntax errors.
+    message("Patching architectures for ${TARGET_NAME}")
+    set_target_properties(${TARGET_NAME} PROPERTIES
+        XCODE_ATTRIBUTE_ARCHS[sdk=iphoneos*] "arm64"
+        XCODE_ATTRIBUTE_ARCHS[sdk=iphonesimulator*] "x86_64"
+    )
+endwhile()