RFR JDK-8173140: To upgrade bundled zlib version from 1.2.8 to 1.2.11

[Xueming Shen]

Hi,

Please review the change to upgrade the zlib bundled in jdk repo from v1.2.8
to v1.2.11. jdk9 by default has been configured to build by using the 
native/
platform/os's zlib on all non-windows platform [1] So the change will 
only have
effect on the Windows' binaries.

issue: https://bugs.openjdk.java.net/browse/JDK-8173140
webrev: http://cr.openjdk.java.net/~sherman/8173140

As always, any source level changes, compared to the official zlib 
release, other
than the copyright notes addition,  is logged at

http://cr.openjdk.java.net/~sherman/8173140/webrev/src/java.base/share/native/libzip/zlib-1.2.11/patches/ChangeLog_java.html

most are for removing the compiler warning. Compared ot 1.2.8 the gz* code
are removed from the repo. as they are actually not used really by the jdk.

(arguably, it appears the version number in directory path zlib-1.2.11 
in the
repo is not necessary. The make file changes would not be necessary if the
path is simply src/java.base/share/native/libzip/zlib)

Thanks,
Sherman

[1] https://bugs.openjdk.java.net/browse/JDK-8031767