8243997: Linux build failed after JDK-8242244

Reviewed-by: ihse

src/hotspot/os/linux/os_linux.cpp

@@ -110,6 +110,7 @@
 # include <stdint.h>
 # include <inttypes.h>
 # include <sys/ioctl.h>
+# include <linux/elf-em.h>
 
 #ifndef _GNU_SOURCE
   #define _GNU_SOURCE
@@ -1845,6 +1846,9 @@ void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
     char*         name;         // String representation
   } arch_t;
 
+#ifndef EM_AARCH64
+  #define EM_AARCH64    183               /* ARM AARCH64 */
+#endif
 #ifndef EM_RISCV
   #define EM_RISCV      243               /* RISC-V */
 #endif