Fix crash in get_executable_filename on FreeBSD

[yurivict]

The std::vector object needs to have the element allocated in order to take its address.

[jenkins-cscs]

Can one of the admins verify this patch?

[hkaiser]

The std::vector object needs to have the element allocated in order to take its address.

Excellent catch, thanks!

[hkaiser]

LGTM, thanks!

[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
✅ +0.15%	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (3521f71)	222028	188803	85.04%
Head commit (03d01dc)	191067 (-30961)	162766 (-26037)	85.19% (+0.15%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6499)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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