Give a generic failure message

Author: CodaFi

utils/make-pkgconfig.swift

@@ -107,6 +107,7 @@ func makeFile() throws {
 do {
   try makeFile()
 } catch {
-//  print("error: \(error)")
+  // FIXME: Printing the thrown error that here crashes on Linux.
+  print("Unexpected error occured while writing the config file.  Check permissions and try again.")
   exit(-1)
 }