hg: jdk9/sandbox: 3 new changesets

[magnus.ihse.bursie at oracle.com]

Changeset: 6c8374e1e696
Author:    ihse
Date:      2015-04-01 13:16 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/6c8374e1e696

Rename variable to main_targets_file.

! make/Init.gmk

Changeset: e3143b59cffd
Author:    ihse
Date:      2015-04-01 13:45 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/e3143b59cffd

Extract logic into DefineMainTargets.

! make/Init.gmk
! make/InitSupport.gmk

Changeset: 4ffbf4c27b7a
Author:    ihse
Date:      2015-04-01 14:48 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/rev/4ffbf4c27b7a

Use DefineMainTargets in all cases for determining main targets.

! make/Init.gmk
! make/InitSupport.gmk