RFR: 8282219: jdk/java/lang/ProcessBuilder/Basic.java fails on AIX [v4]

[Ichiroh Takiguchi]

On Wed, 23 Feb 2022 19:59:46 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Ichiroh Takiguchi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add null check
>
> The changes seem ok, modifying both the LIBPATH passed in the environment and the expected return value.
> 
> Since both of these tests are testing a different condition, the presence/accuracy of LIBPATH is not the point of the test.

@RogerRiggs 
I'm using AIX 7.1.
AIX 5.3 and 6.1 were already in EOL.
OK, another way, `LIBPATH=...` can be removed from `result`.
Also we can use #7581 .

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