Add a target option for selecting a DWARF version

Certain platforms need to limit the DWARF version emitted (oxs, *bsd). This
change adds a dwarf_version entry to the options that allows a platform to
specify the dwarf version to use. By default this option is none and the default
DWARF version is selected.

Also adds an option for printing Option<u32> json keys

compiler/rustc_target/src/spec/android_base.rs

@@ -9,6 +9,7 @@ pub fn opts() -> TargetOptions {
         .unwrap()
         .push("-Wl,--allow-multiple-definition".to_string());
     base.is_like_android = true;
+    base.dwarf_version = Some(2);
     base.position_independent_executables = true;
     base.has_elf_tls = false;
     base.requires_uwtable = true;