cb77dc820f
2d483142a7 Remove 'boost::optional'-related gcc warnings (Hennadii Stepanov)
Pull request description:
#14711 introduced some warnings when building with gcc compiler.
See:
- https://github.com/bitcoin/bitcoin/pull/14711#issuecomment-454760017 by @laanwj
- https://github.com/bitcoin/bitcoin/pull/14711#pullrequestreview-193702611 by @ryanofsky
This gcc [issue](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47679) has been known since version 4.6.0 and last updated in 2017.
From the boost [docs](https://www.boost.org/doc/libs/1_69_0/libs/optional/doc/html/boost_optional/quick_start/optional_automatic_variables.html):
> The default constructor of `optional` creates an _uninitialized_ `optional` object.
Also: [False positive with -Wmaybe-uninitialized](https://www.boost.org/doc/libs/1_69_0/libs/optional/doc/html/boost_optional/tutorial/gotchas/false_positive_with__wmaybe_uninitialized.html) ([pointed out](https://github.com/bitcoin/bitcoin/pull/15292#issuecomment-459063170) by @Empact)
This PR removes these warnings.
cc: @Empact @practicalswift
Tree-SHA512: 752ae3c3ca6282bbf98726236fbc3069ab9d1aee57ae2ec2668b32e4541e7bc1acb15b7d6fa9e2b6daf1ec29c0987a1053ee1ca0f523b71367ff911221c58c94Bitcoin Core integration/staging tree
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