RFR: 8282219: jdk/java/lang/ProcessBuilder/Basic.java fails on AIX

[Ichiroh Takiguchi]

Run jtreg:jdk/java/lang/ProcessBuilder/Basic.java on AIX.
The test was failed by:
  Incorrect handling of envstrings containing NULs

According to my investigation, this issue was happened after following change was applied.
JDK-8272600: (test) Use native "sleep" in Basic.java

test.nativepath value was added into AIX's LIBPATH during running this testcase.
On AIX, test.nativepath value should be removed from LIBPATH value before comparing the values.

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Commit messages:
 - 8282219: jdk/java/lang/ProcessBuilder/Basic.java fails on AIX

Changes: https://git.openjdk.java.net/jdk/pull/7574/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7574&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282219
  Stats: 18 lines in 1 file changed: 14 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7574.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7574/head:pull/7574

PR: https://git.openjdk.java.net/jdk/pull/7574