internal/build:compile with c mode,when c file

runtime/internal/clite/debug/_wrap/debug.c

@@ -9,8 +9,6 @@
 #include <dlfcn.h>
 #include <libunwind.h>
 
-extern "C" {
-
 void *llgo_address() {
     return __builtin_return_address(0);
 }
@@ -40,6 +38,4 @@ void llgo_stacktrace(int skip, void *ctx, int (*fn)(void *ctx, void *pc, void *o
             }
         }
     }
-}
-
-}
+}

runtime/internal/clite/debug/debug.go

@@ -9,7 +9,7 @@ import (
 )
 
 const (
-	LLGoFiles = "$(llvm-config --cflags): _wrap/debug.cpp"
+	LLGoFiles = "$(llvm-config --cflags): _wrap/debug.c"
 )
 
 type Info struct {