[musl] Crash (`could not load library "libpcre2-8"`) when trying to run the Julia binary in the `tester_musl64` CI job

[DilumAluthge]

In the tester_musl64 CI job, when trying to run ./julia -e 'using InteractiveUtils; InteractiveUtils.versioninfo()' at the beginning of the job, the following error occurs.

Full log: https://buildkite.com/julialang/julia-master/builds/5491#ee577fe6-6856-4ef3-8e83-2bbd5481cf4c

fatal: error thrown and no exception handler available.
InitError(mod=:Sys, error=ErrorException("could not load library "libpcre2-8"
Error loading shared library libpcre2-8.so: No such file or directory"))
ijl_errorf at /cache/build/amdci5-0/julialang/julia-master/src/rtutils.c:77
ijl_load_dynamic_library at /cache/build/amdci5-0/julialang/julia-master/src/dlload.c:274
jl_get_library_ at /cache/build/amdci5-0/julialang/julia-master/src/runtime_ccall.cpp:48 [inlined]
jl_get_library_ at /cache/build/amdci5-0/julialang/julia-master/src/runtime_ccall.cpp:30
ijl_load_and_lookup at /cache/build/amdci5-0/julialang/julia-master/src/runtime_ccall.cpp:61
jlplt_pcre2_compile_8_32593 at /cache/build/amdci4-2/julialang/julia-master/julia-707c57c490/lib/julia/sys.so (unknown line)
compile at ./pcre.jl:151
compile at ./regex.jl:82
#occursin#452 at ./regex.jl:265 [inlined]
occursin at ./regex.jl:265 [inlined]
isdirpath at ./path.jl:117 [inlined]
normpath at ./path.jl:373
abspath at ./path.jl:430
abspath at ./path.jl:439 [inlined]
__init_build at ./sysinfo.jl:125
__init__ at ./sysinfo.jl:117
jfptr___init___22147 at /cache/build/amdci4-2/julialang/julia-master/julia-707c57c490/lib/julia/sys.so (unknown line)
_jl_invoke at /cache/build/amdci5-0/julialang/julia-master/src/gf.c:2256 [inlined]
ijl_apply_generic at /cache/build/amdci5-0/julialang/julia-master/src/gf.c:2438
jl_apply at /cache/build/amdci5-0/julialang/julia-master/src/julia.h:1773 [inlined]
jl_module_run_initializer at /cache/build/amdci5-0/julialang/julia-master/src/toplevel.c:73
_finish_julia_init at /cache/build/amdci5-0/julialang/julia-master/src/init.c:753
julia_init at /cache/build/amdci5-0/julialang/julia-master/src/init.c:687
jl_repl_entrypoint at /cache/build/amdci5-0/julialang/julia-master/src/jlapi.c:700
main at /cache/build/amdci5-0/julialang/julia-master/cli/loader_exe.c:59
unknown function (ip: 0x7f65dbf64a02)
🚨 Error: The command exited with status 1

[DilumAluthge]

Introduced by #42919