Fix Linux warnings

Author: finestructure

Sources/ShellOut.swift

@@ -398,7 +398,11 @@ extension ShellOutCommand {
 
 private extension Process {
     @discardableResult func launchBash(with command: String, outputHandle: FileHandle? = nil, errorHandle: FileHandle? = nil, environment: [String : String]? = nil) throws -> String {
+#if os(Linux)
+        executableURL = URL(fileURLWithPath: "/bin/bash")
+#else
         launchPath = "/bin/bash"
+#endif
         arguments = ["-c", command]
 
         if let environment = environment {
@@ -438,7 +442,11 @@ private extension Process {
         }
         #endif
 
+#if os(Linux)
+        try run()
+#else
         launch()
+#endif
 
         #if os(Linux)
         outputQueue.sync {