8346987: [lto] gtest build fails

[MBaesken]

When building with link time optimization (lto) , configure flag is --enable-jvm-feature-link-time-opt , we run in the gtest build into a lot of errors.
One workaround is just to configure without gtest ; this one changes the make to NOT use the lto build flags for gtest , just for the "normal" libjvm.so .

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• JDK-8346987: [lto] gtest build fails (Bug - P4)

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