Rollup merge of rust-lang#54402 - bgermann:master, r=alexcrichton

Use no_default_libraries for all NetBSD flavors

The no_default_libraries was introduced in rust-lang#28578 because the
NetBSD-based rumprun needed to disable the link flag.
This moves the definition to be used by all NetBSD linker flavors to
close rust-lang#49627.

A different solution would be adding -lc but as there is no platform
with explicit -lc, this approach is used.

src/librustc_target/spec/netbsd_base.rs

@@ -29,6 +29,7 @@ pub fn opts() -> TargetOptions {
  executables: true,
  target_family: Some("unix".to_string()),
  linker_is_gnu: true,
+ no_default_libraries: false,
  has_rpath: true,
  pre_link_args: args,
  position_independent_executables: true,

src/librustc_target/spec/x86_64_rumprun_netbsd.rs

@@ -21,7 +21,6 @@ pub fn target() -> TargetResult {
  base.has_rpath = false;
  base.position_independent_executables = false;
  base.disable_redzone = true;
- base.no_default_libraries = false;
  base.exe_allocation_crate = None;
  base.stack_probes = true;