Match libunwind baremetal symbol name

Author: roblabla

unwind/src/find_cfi/baremetal.rs

@@ -4,8 +4,8 @@ use super::EhRef;
 extern "C" {
     static __text_start: usize;
     static __text_end: usize;
-    static __ehframehdr_start: usize;
-    static __ehframehdr_end: usize;
+    static __eh_frame_hdr_start: usize;
+    static __eh_frame_hdr_end: usize;
 }
 
 pub fn find_cfi_sections() -> Vec<EhRef> {
@@ -15,8 +15,8 @@ pub fn find_cfi_sections() -> Vec<EhRef> {
         // of those values.
         let text_start = &__text_start as *const _ as u64;
         let text_end = &__text_end as *const _ as u64;
-        let cfi_start = &__ehframehdr_start as *const _ as u64;
-        let cfi_end = &__ehframehdr_end as *const _ as u64;
+        let cfi_start = &__eh_frame_hdr_start as *const _ as u64;
+        let cfi_end = &__eh_frame_hdr_end as *const _ as u64;
 
         cfi.push(EhRef {
             obj_base: 0,