hg: jdk7/build/corba: 6956930: Remove unused OS_VENDOR make variable

[kelly . ohair]

Changeset: 1b5234624436
Author:    ohair
Date:      2010-05-28 10:40 -0700
URL:       http://hg.openjdk.java.net/jdk7/build/corba/rev/1b5234624436

6956930: Remove unused OS_VENDOR make variable
Reviewed-by: trims

! make/common/shared/Platform.gmk