Add setter for enabling multi-memory to the C API.

This commit adds `wasmtime_config_wasm_multi_memory_set` to the C API.

Fixes #3066.

crates/c-api/include/wasmtime/config.h

@@ -176,6 +176,14 @@ WASMTIME_CONFIG_PROP(void, wasm_bulk_memory, bool)
  */
 WASMTIME_CONFIG_PROP(void, wasm_multi_value, bool)
 
+/**
+ * \brief Configures whether the WebAssembly multi-memory proposal is
+ * enabled.
+ *
+ * This setting is `false` by default.
+ */
+WASMTIME_CONFIG_PROP(void, wasm_multi_memory, bool)
+
 /**
  * \brief Configures whether the WebAssembly module linking proposal is
  * enabled.

crates/c-api/src/config.rs

@@ -90,6 +90,11 @@ pub extern "C" fn wasmtime_config_wasm_multi_value_set(c: &mut wasm_config_t, en
     c.config.wasm_multi_value(enable);
 }
 
+#[no_mangle]
+pub extern "C" fn wasmtime_config_wasm_multi_memory_set(c: &mut wasm_config_t, enable: bool) {
+    c.config.wasm_multi_memory(enable);
+}
+
 #[no_mangle]
 pub extern "C" fn wasmtime_config_wasm_module_linking_set(c: &mut wasm_config_t, enable: bool) {
     c.config.wasm_module_linking(enable);