[8u] RFR(XS): 8244461: [JDK 8u] Build fails with glibc 2.32

[Severin Gehwolf]

Hi,

Please review this OpenJDK 8u (and 7u) specific patch which fixes a
build failure with
upcoming glibc 2.32 release. This isn't an issue in later JDKs because
headers got cleaned
up by JDK-8167481. Bringing this back into OpenJDK 8u together with
dependencies for this
two liner fix seems overkill and bears more risk. Hence, a point-fix
for OpenJDK 8u (and
possibly 7u). Note that sys/sysctl.h removals are in Linux specific
ifdef branches and sysctl
isn't being used in those files anyway. From a functionality
perspective this should be a no-op.

Bug: https://bugs.openjdk.java.net/browse/JDK-8244461
webrev: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8244461/01/webrev/

Testing: Build on Linux system with preview release of glibc 2.32 now
works, failed before.

Thoughts?

Thanks,
Severin