Respect ENABLE_LTO even for static build, but keep LTO default for static #4320
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Up until now, the ENABLE_LTO option was ignored for static builds. This can be quite confusing. With this change, the static now defaults to using LTO, but it is possible to override it explicitly.
Also, the check for GCC 8+ for LTO is no longer necessary as p4c supports only GCC 9+.