Need reviewer: jdk/make/common/shared/Defs-windows.gmk

[Kelly O'Hair]

Need reviewer: jdk/make/common/shared/Defs-windows.gmk

Minor correction that impacts anyone that installs VS2010 in a non- 
space location or sets
VS100COMNTOOLS to a directory with no spaces.

7011382: Fix use of VS100COMNTOOLS when installed in non-default or  
non-space path
http://cr.openjdk.java.net/~ohair/openjdk7/jdk7-build-VS100/webrev/

-kto