hg: jdk7/build/jdk: 6611629: Avoid hardcoded cygwin paths for memory detection

[kelly.ohair at sun.com]

Changeset: 9ae5ccf6891c
Author:    ohair
Date:      2008-03-19 13:26 -0700
URL:       http://hg.openjdk.java.net/jdk7/build/jdk/rev/9ae5ccf6891c

6611629: Avoid hardcoded cygwin paths for memory detection
Summary: Use free with sygwin, mem or systeminfo otherwise, to get MB_OF_MEMORY on windows.
Reviewed-by: tbell

! make/common/shared/Platform.gmk