Really fix the 3.0.2 archives SHA1 sums.

This corresponds to the archives with the correct configure version in them,
finally.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77963 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Check that there are no uncommitted changes in the release script.

Any such changes wouldn't be included in the release, which is probably
unexpected.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77964 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775