Adapt raw_window_handle 0.4 for nih_plug_iced

I tried updating iced instead, but after a couple hours porting things I
gave up. Supporting newer iced versions will probably require rebuilding
the crate from scratch.

Cargo.lock

@@ -614,24 +614,6 @@ dependencies = [
  "xcb-util",
 ]
 
-[[package]]
-name = "baseview"
-version = "0.1.0"
-source = "git+https://github.com/RustAudio/baseview.git#f0639b787bbda506434d3f6b5c91e94ca59904c6"
-dependencies = [
- "cocoa",
- "core-foundation",
- "keyboard-types",
- "nix 0.22.3",
- "objc",
- "raw-window-handle 0.5.2",
- "uuid",
- "winapi",
- "x11",
- "xcb 0.9.0",
- "xcb-util",
-]
-
 [[package]]
 name = "bindgen"
 version = "0.68.1"
@@ -2228,9 +2210,9 @@ dependencies = [
 [[package]]
 name = "iced_baseview"
 version = "0.0.3"
-source = "git+https://github.com/robbert-vdh/iced_baseview.git?branch=feature/update-baseview#07f1b07d3a8bf2a9af0ce6ee57443105ac99de33"
+source = "git+https://github.com/robbert-vdh/iced_baseview.git?branch=feature/update-baseview#df3a852a15cf0e9fcc8d2b32f5718e56780beaf3"
 dependencies = [
- "baseview 0.1.0 (git+https://github.com/RustAudio/baseview.git)",
+ "baseview 0.1.0 (git+https://github.com/RustAudio/baseview.git?rev=1d9806d5bd92275d0d8142d9c9c90198757b9b25)",
  "copypasta 0.7.1",
  "iced_core",
  "iced_futures",
@@ -2928,11 +2910,12 @@ name = "nih_plug_iced"
 version = "0.0.0"
 dependencies = [
  "atomic_refcell",
- "baseview 0.1.0 (git+https://github.com/RustAudio/baseview.git)",
+ "baseview 0.1.0 (git+https://github.com/RustAudio/baseview.git?rev=1d9806d5bd92275d0d8142d9c9c90198757b9b25)",
  "crossbeam",
  "iced_baseview",
  "nih_plug",
  "nih_plug_assets",
+ "raw-window-handle 0.4.3",
  "serde",
 ]