RFR: JDK9: 8028407: adjust-mflags.sh failed build with GNU Make 4.0 with -I<path contains j>

[Henry Jen]

Hi,

This is a follow up on an issue first reported on Nov. 2, the fix had 
been discussed at that time[1] and works for me.

The issue is that the sed command in adjust-mflags.sh trying to isolate 
-j switch failed to deal with new MFLAGS format spitted out by gmake 4, 
where the -I<path> without a space, and so if the path contains 'j', the 
script is confused.

Here is a webrev for JDK9,
http://cr.openjdk.java.net/~henryjen/jdk9/8028407/0/

Would like to have a sponsor review and push the change, I am tired of 
patching this. :)

[1] 
http://mail.openjdk.java.net/pipermail/hotspot-dev/2013-November/011692.html

Cheers,
Henry