Fix gcc11 annonymous namespace warnings

This fixes warnings of the following type:

warning: 'MEPProvider' has a field 'MEPProvider::m_bad_mfps_sd' whose type uses the anonymous namespace [-Wsubobject-linkage]

where MEPProvider is a Service and m_bad_mfps_sd is a Gaudi::Accumulators::Histogram<1, Gaudi::Accumulators::atomicity::full, float>.

mentioned in merge request lhcb/MooreOnline!154 (merged)

approved this merge request

added lhcb-gaudi-head label

assigned to @clemenci

changed milestone to %v36r10

• [2023-02-11 00:06] Validation started with lhcb-gaudi-head#3473
• [2023-02-11 00:14] Validation started with lhcb-run2-gaudi-head#456
• [2023-02-12 00:04] Validation started with lhcb-gaudi-head#3474

mentioned in commit 1504ceda

merged

mentioned in commit lhcb/Rec@735eec2c

mentioned in merge request lhcb/Rec!3318 (merged)

mentioned in commit lhcb/Rec@69f6374a

mentioned in commit lhcb/Rec@7cd9cea1