remove unused imports

src/librustc_target/spec/thumbv4t_none_eabi.rs

@@ -8,7 +8,7 @@
 //!
 //! **Important:** This target profile **does not** specify a linker script. You just get the default link script when you build a binary for this target. The default link script is very likely wrong, so you should use `-Clink-arg=-Tmy_script.ld` to override that with a correct linker script.
 
-use crate::spec::{LinkerFlavor, PanicStrategy, RelocModel, Target, TargetOptions, TargetResult};
+use crate::spec::{LinkerFlavor, Target, TargetOptions, TargetResult};
 
 pub fn target() -> TargetResult {
     Ok(Target {