RFR: JDK-8031767 Support system or alternative implementations of zlib

[Xueming Shen]

Hi

Please help codereview the change to build the jdk9 runtime to use the 
system zlib on
Solaris and Linux platforms by default.

Issue: https://bugs.openjdk.java.net/browse/JDK-8031767
Webrev: http://cr.openjdk.java.net/~sherman/8031767/webrev/

Background info:

Compression is heavily used in Java based big data/middle-ware applications.
There are many products in market today that help compression performance
either through software or hardware acceleration and most likely these 
products
support the zlib interface as API, for example Intel's IPP library has a 
faster
version of compression libraries. To configure the Java runtime to use 
the system
zlib would make these acceleration capabilities available to java users 
through
java.util.zip package directly. The jdk already has a build 
configuration option
to build the jdk to use the system zlib via "--with-zlib=system" and the 
OSX is
by default built to use the system zlib. This proposal is to propose to 
build
the jdk to use the system zlib library (the zlib bundled by the 
underlying Solaris/
Linuxplatforms), instead of the binary  built from source code jdk 
repository
(current 1.2.8 from the open source zlib.org)

Thanks,
Sherman


btw, attached is the similar change in the closed repo: 
autoconf/generated-configure.sh
-------------------------------------------------------------

# Do not change or remove the following line, it is needed for consistency checks:
-DATE_WHEN_GENERATED=1454436146
+DATE_WHEN_GENERATED=1454626552
  
  ###############################################################################
  #
  # Initialization / Boot-strapping
  #

------------------------------------------------------------------------

@@ -58839,14 +58839,14 @@
  
  
    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for which zlib to use" >&5
  $as_echo_n "checking for which zlib to use... " >&6; }
  
- DEFAULT_ZLIB=bundled
- if test "x$OPENJDK_TARGET_OS" = xmacosx; then
- # On macosx default is system...on others default is bundled
      DEFAULT_ZLIB=system
+ if test "x$OPENJDK_TARGET_OS" = xwindows; then
+ # On windows default is bundled...on others default is system
+ DEFAULT_ZLIB=bundled
    fi
  
    if test "x${ZLIB_FOUND}" != "xyes"; then
      # If we don't find any system...set default to bundled
      DEFAULT_ZLIB=bundled