Fix unused-variable error for lower gcc version due to structure bindings #2265
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PragmaTwice
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Gcc with lower version will report an error when any variable of the structured binding is not used. When compile the project, it will fail due to the unused-variable. If gcc verion is less than 8, disable unused-variable check.
Details: https://gcc.gnu.org/bugzilla/show_bug.cgi?format=multiple&id=81767
This fixes #2215