RFR(S) 8074312: Enable hotspot builds on 4.x Linux kernels

[Severin Gehwolf]

Hi,

Could someone please review the following one-liner to the hotspot build
files. This prevents someone from building on 4.x Linux kernels such as
F22, which will become available in May 2015[1].

Currently, a JDK 9 build fails for me with:
>&2 echo "*** This OS is not supported:" `uname -a`; exit 1;
++ uname -a
+ echo '*** This OS is not supported:' Linux f22 4.0.0-0.rc1.git0.1.fc22.x86_64 '#1' SMP Mon Feb 23 21:15:25 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
*** This OS is not supported: Linux f22 4.0.0-0.rc1.git0.1.fc22.x86_64 #1 SMP Mon Feb 23 21:15:25 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
+ exit 1

The fix is to add 4 to the list of Linux kernels, similar to what was
done for 3.x kernels in JDK-7072341.

Bug: https://bugs.openjdk.java.net/browse/JDK-8074312
webrev: http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8074312/webrev.00/

I'd also please need a sponsor for this change.

Thanks,
Severin

[1] http://fedoraproject.org/wiki/Releases/22/Schedule