RFR: 8259943: FileDescriptor.close0 does not handle EINTR [v2]

[Brian Burkhalter]

> Please review this small change to handle `EINTR` from `close()` in `fileDescriptorClose()`. The function `handleGetLength()` is also changed to handle `EINTR` from `fstat64()` to match other uses of `fstat64()` in the file.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8259943: Suppress RESTARTABLE for non-AIX.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2173/files
  - new: https://git.openjdk.java.net/jdk/pull/2173/files/047dac0b..d351118a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2173&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2173&range=00-01

  Stats: 5 lines in 1 file changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2173.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2173/head:pull/2173

PR: https://git.openjdk.java.net/jdk/pull/2173