Bug: HDFFV-8433
The temporary directory used by zip is the same as the rest but it has to be different.
Changed tar2zip to use a different (ztmpdir) name.

Tested: by hand running "bin/release ... gzip zip md5".


git-svn-id: https://svn.hdfgroup.uiuc.edu/hdf5/trunk@25136 dab4d1a6-ed17-0410-a064-d1ae371a2980