[Interest] Disable -Og when configuring as developer build

[Konstantin Shegunov]

Hello,
That flag's been a pain for me to debug the Qt codebase for a while now,
I'm really annoyed that configure generates it when using -developer-build.
Long story short it prevents me to do step-by-step with gdb as the compiler
reorders the code as it sees fit (no clue why). I remember I had found a
commit from about 2-3 years ago which introduced it, and even found how to
disable it, but for the life of me I couldn't find it again during my most
recent searches.
How can I disable the debug optimizations, and I mean completely?

Thanks!
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