Description of problem:
gzeof is not set when reading from a compressed file,
instead gzread is returning 0

This happens with Redhats zlib-1.2.0.7-1 but not with the original zlib-1.1.4

Version-Release number of selected component (if applicable):
zlib-1.2.0.7-1.src.rpm

How reproducible:
100%  see attached test 

Steps to Reproduce:
1. build and install zlib-1.1.4.tar.gz from http://www.gzip.org/zlib/ into
/usr/local
2. unpack attached "ztest.tgz" test case
3. cd ztest; make test1, make test2
    
Actual results:
test1 uses zlib-1.1.4 and terminates successfully
test2 uses zlib-1.2.0.7 and enters an infinite loop.

Expected results:
gzeof should be set at eof on compressed file input.

Additional info: