Win: Add dbghelp to the list of import libraries

Author: ChrisDenton

library/windows_targets/src/lib.rs

@@ -38,4 +38,5 @@ pub macro link {
 #[link(name = "ntdll")]
 #[link(name = "userenv")]
 #[link(name = "ws2_32")]
+#[link(name = "dbghelp")] // required for backtrace-rs symbolization
 extern "C" {}