RFR: 8242244: Remove redundant ELF machine definitions

[Ao Qi]

Hi,

It failed to build on my two linux x64 machines after this fix. They
are Ubuntu 18.04.4(5.3.0-46-generic) and CentOS Linux release
8.1.1911(4.18.0-147.el8.x86_64). Should we add this patch:
$ hg diff
diff -r 7205265660b2 src/hotspot/os/linux/os_linux.cpp
--- a/src/hotspot/os/linux/os_linux.cpp Tue Apr 28 05:53:19 2020 -0400
+++ b/src/hotspot/os/linux/os_linux.cpp Tue Apr 28 18:24:45 2020 +0800
@@ -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

Thanks,
Ao Qi

On Tue, Apr 28, 2020 at 7:48 AM John Paul Adrian Glaubitz
<glaubitz at physik.fu-berlin.de> wrote:
>
> Hi David!
>
> On 4/28/20 12:53 AM, David Holmes wrote:
> > Apologies as I just spotted this in my mail backlog.
>
> No worries ;).
>
> > This seems fine and trivial.
> Thanks. I post a rebased version tomorrow - necessary because I added
> the definition for EM_RISCV to make sure we don't run into build issues
> with slightly older kernels has EM_RISCV hasn't been defined in the
> kernel for too long yet.
>
> Adrian
>
> --
>  .''`.  John Paul Adrian Glaubitz
> : :' :  Debian Developer - glaubitz at debian.org
> `. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
>   `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913