RFR (XS) 8033946 - Hotspot build should ignore "ide" folder

[Gerard Ziemski]

hi all,

Please review a very small fix that makes hotspot build ignore "ide" 
folder, which is where local users can store their own favorite IDE 
projects.

For those interested, I have an Xcode project for JDK8 and JDK9 that I 
am personally actively supporting and using, which is hosted at 
https://orahub.oraclecorp.com/gerard.ziemski/xcode that is meant to be 
put in "jdk/hotspot/ide" folder.


Summary of fix:

Exclude "ide" folder from the makefile that searches for hotspot src 
files, or otherwise make bails out complaining that it does not know how 
to handle Xcode project files.


Testing:

Passes local build on Mac OS X


References:

bug: https://bugs.openjdk.java.net/browse/JDK-8033946

webrev: http://cr.openjdk.java.net/~gziemski/8033946_rev0/


Thank you!