add changes from whisper.cpp update

src/whisper_state.rs

@@ -0,0 +1,26 @@
+/// Rustified pointer to a Whisper state.
+#[derive(Debug)]
+pub struct WhisperState {
+    ptr: *mut whisper_rs_sys::whisper_state,
+}
+
+unsafe impl Send for WhisperState {}
+unsafe impl Sync for WhisperState {}
+
+impl Drop for WhisperState {
+    fn drop(&mut self) {
+        unsafe {
+            whisper_rs_sys::whisper_free_state(self.ptr);
+        }
+    }
+}
+
+impl WhisperState {
+    pub(crate) unsafe fn new(ptr: *mut whisper_rs_sys::whisper_state) -> Self {
+        Self { ptr }
+    }
+
+    pub(crate) fn as_ptr(&self) -> *mut whisper_rs_sys::whisper_state {
+        self.ptr
+    }
+}