Add plugin frameworks to macOS example link step (#148)

Speculative fix for issue #132

Author: stuartmorgan

example/macos/ExampleEmbedder.xcodeproj/project.pbxproj

@@ -31,6 +31,9 @@
 		33CC110F2044A8940003C045 /* FlutterEmbedderMac.framework in Bundle Framework */ = {isa = PBXBuildFile; fileRef = 33CC11042044A7620003C045 /* FlutterEmbedderMac.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		33CC11132044BFA00003C045 /* ExampleWindow.swift in Sources */ = {isa = PBXBuildFile; fileRef = 33CC11122044BFA00003C045 /* ExampleWindow.swift */; };
 		33CC112F204626C80003C045 /* flutter_assets in Resources */ = {isa = PBXBuildFile; fileRef = 33CC112C20461AD40003C045 /* flutter_assets */; };
+		33E98C0521824E4000EB88EF /* FlutterEmbedderMenubar.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3329009320D84F6E002E5F16 /* FlutterEmbedderMenubar.framework */; };
+		33E98C0721824E4800EB88EF /* FlutterEmbedderFileChooser.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3329004F20D2EC7C002E5F16 /* FlutterEmbedderFileChooser.framework */; };
+		33E98C0821824E4C00EB88EF /* FlutterEmbedderColorPanel.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 3329FFFB20C9F5AC002E5F16 /* FlutterEmbedderColorPanel.framework */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -137,6 +140,9 @@
 			buildActionMask = 2147483647;
 			files = (
 				33CC110D2044A8790003C045 /* FlutterEmbedderMac.framework in Frameworks */,
+				33E98C0821824E4C00EB88EF /* FlutterEmbedderColorPanel.framework in Frameworks */,
+				33E98C0721824E4800EB88EF /* FlutterEmbedderFileChooser.framework in Frameworks */,
+				33E98C0521824E4000EB88EF /* FlutterEmbedderMenubar.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};