Fixed: Unknown 'stack-protector-strong' GCC option - option has been …

Quote from i-MSCP Github (1.5.x)

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1. Fixed: Unknown 'stack-protector-strong' GCC option - option has been introduced in GCC 4.9 (regression fix)

Source: https://github.com/i-MSCP/imsc…35bc7cd6dab946c84c0ce242f