RFR: 8269037: jsig/Testjsig.java doesn't have to be restricted to linux only

[Igor Ignatyev]

Hi all,

could you please review this small patch that enables `runtime/jsig/Testjsig.java` test and compilation of its native library on all platforms but windows?
from JBS:
> `runtime/jsig/Testjsig.java` test currently `@requires (os.family == "linux")` and `test/hotspot/jtreg/runtime/jsig/libTestJNI.c` compilation is restricted to linux only, however there seems to be nothing in the test code that prevents it from execution on a system that supports POSIX.

testing:  `runtime/jsig/Testjsig.java` on `{linux,windows,macosx}-x64`

Thanks,
-- Igor

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Commit messages:
 - 8269037

Changes: https://git.openjdk.java.net/jdk/pull/4975/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4975&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269037
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4975.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4975/head:pull/4975

PR: https://git.openjdk.java.net/jdk/pull/4975