jdk11 LIBZIP build and 8201349: build broken when configured with --with-zlib=bundled on gcc 7.3

[Baesken, Matthias]

Hello,  we were running into  build errors  recently  when using gcc-7   and  with-zlib=bundled    in jdk11u-dev .
This combination worked nicely in jdk/jdk .

Reason is that in jdk11 we do not have :

8201349: build broken when configured with --with-zlib=bundled on gcc 7.3

https://hg.openjdk.java.net/jdk/jdk/rev/c35eac313084

which unfortunately has a predecessor

8211029: Have a common set of enabled warnings for all native libraries

https://hg.openjdk.java.net/jdk/jdk/rev/ec62d6cab037


I'd like to have   the  gcc - warning disablements for   LIBJLI  / LIBZIP ,  but taking over the large patch   8211029    to  11   looks a bit too much .

Should I just post a separate patch  for jdk11u-dev  with the gcc warning disablements  for  LIBJLI / LIBZIP :

DISABLED_WARNINGS_gcc := unused-function implicit-fallthrough, \


? This fixes our build issues and sounds reasonable and small .

Thanks, Matthias