Fix macOS building from Xcode

Examples/SentryExampleMacOS/main.swift

@@ -10,6 +10,8 @@ struct MacOSExample {
     defer { Sentry.close() }
 
     print("Hello macOS")
+
+    RunLoop.current.run()
   }
 
   static func startSentry() {

Package.swift

@@ -45,7 +45,8 @@ let package = Package(
         ),
         .testTarget(
             name: "SwiftSentryTests",
-            dependencies: ["SwiftSentry"]
+            dependencies: ["SwiftSentry"],
+            swiftSettings: swiftSettings
         ),
     ]
 )

Sources/sentry/dummy.c

@@ -0,0 +1 @@
+// A required, empty file to ensure that when building from Xcode that a .o is produced.

Tests/SwiftSentryTests/swift_sentryTests.swift → Tests/SwiftSentryTests/SwiftSentryTests.swift

@@ -1,7 +1,7 @@
 import XCTest
-@testable import swift_sentry
+@testable import SwiftSentry
 
-final class swift_sentryTests: XCTestCase {
+final class SwiftSentryTests: XCTestCase {
     func testExample() throws {
         // XCTest Documentation
         // https://developer.apple.com/documentation/xctest