replace the GnuWin32 version of libz.a with my own build with MinGW.
replace the GnuWin32 version of libz.a with my own build with MinGW.


git-svn-id: ba63ac760bf0f03e6bf5520b5300f1a364b8a096@431 fd675618-d7d1-4fc3-a54f-e58cce934862

pjotrp/samtools,pjotrp/samtools,pjotrp/samtools