rec: fix two issues building rec using meson on debian11

[omoerbeek]

1. Local arc4random was not declared as dependency
2. libresolv was not found (no pkgconfig file) but is still needed

Short description

Checklist

I have:

• read the CONTRIBUTING.md document
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)
• checked that this code was merged to master

[coveralls]

Pull Request Test Coverage Report for Build 12951709444

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 37 unchanged lines in 10 files lost coverage.
• Overall coverage increased (+0.02%) to 64.722%

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Files with Coverage Reduction	New Missed Lines	%
modules/gpgsqlbackend/gpgsqlbackend.cc	1	88.62%
pdns/pollmplexer.cc	1	83.66%
pdns/recursordist/test-syncres_cc2.cc	3	88.85%
pdns/packethandler.cc	3	72.4%
pdns/recursordist/syncres.cc	3	80.56%
modules/gpgsqlbackend/spgsql.cc	3	67.46%
pdns/dnsdistdist/dnsdist-lbpolicies.cc	4	70.77%
pdns/dnsdistdist/dnsdist-carbon.cc	6	61.87%
pdns/remote_logger.cc	6	52.47%
pdns/recursordist/test-syncres_cc1.cc	7	89.8%

Totals
Change from base Build 12944046345:	0.02%
Covered Lines:	127861
Relevant Lines:	166480

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💛 - Coveralls