Review request: Test bugs to add cygwin support

[Mandy Chung]

Simple fix on these tests to run on cygwin.

7036518: TEST_BUG: add cygwin support to 
test/java/nio/charset/coders/CheckSJISMappingProp.sh
7036519: TEST_BUG: add cygwin support to test/demo/zipfs/basic.sh
Webrev at:
   http://cr.openjdk.java.net/~mchung/7036518/webrev.00/

Thanks
Mandy