RFR: 8341944: The zlib library no longer requires dummy byte for raw inflate [v2]

[Eirik Bjørsnøs]

> Please review this cleanup PR which removes overrides of `InflaterInputStream.fill` in `ZipFileInflaterInputStream` and `ZipFileSystem::getInputStream`. Associated boolean fields used to track `eof` are also removed.
> 
> These overrides exist to provide zlib with an extra dummy byte at the end of raw compressed streams (no wrapping):
> 
> 
> // Override fill() method to provide an extra "dummy" byte
> // at the end of the input stream. This is required when
> // using the "nowrap" Inflater option.
> protected void fill() throws IOException {
> 
> However, zlib has not required such an extra dummy byte since 2003. 
> 
> 
> Changes in 1.2.0 (9 March 2003)
> - New and improved inflate code
>     - Raw inflate no longer needs an extra dummy byte at end
> ``` 
> 
> The code in these overrides is effectively dead and removing it cleans up our code and reclaims weirdness dollars for our budget.
> 
> Risk: I cannot imagine anyone is building OpenJDK with a 21 year old ZLIB.  Please advise if this is the case or if any zlib fork in use still has this limitation.
> 
> Testing: ZIP and ZIPFS tests run green locally. GHA results pending. No tests are added or modified, this is a cleanup-only PR. Manually verified that the code is dead by injecting AssertionErrors.

Eirik Bjørsnøs has updated the pull request incrementally with one additional commit since the last revision:

  Update Inflater and Deflater constructors taking 'nowrap' options to explain more clearly what this option does

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21467/files
  - new: https://git.openjdk.org/jdk/pull/21467/files/661032c8..66abb0dc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21467&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21467&range=00-01

  Stats: 14 lines in 2 files changed: 2 ins; 2 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/21467.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21467/head:pull/21467

PR: https://git.openjdk.org/jdk/pull/21467