8286694: Incorrect argument processing in java launcher

[zzambers]

Backport fixes compiler warning on newer gcc. (Also has been backported to oracle jdk 11)

Backport was clean except for copyright header.

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Progress

• [x] Change must not contain extraneous whitespace
• [x] Commit message must refer to an issue
• [ ] JDK-8286694 needs maintainer approval

Issue

• JDK-8286694: Incorrect argument processing in java launcher (Bug - P4)

Reviewing

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