c47889a shared: Add more dlopen() tests

Authored and Committed by daandemeyer 2 years ago
    shared: Add more dlopen() tests
    
    Add dlopen_dw(), dlopen_elf() and dlopen_pcre2() to the dlopen test.
    To enable adding dlopen_pcre2(), we move pcre2-dlopen.h/c from
    src/journal to src/shared.
    
        
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src/shared/pcre2-dlopen.c src/journal/pcre2-dlopen.c
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src/shared/pcre2-dlopen.h src/journal/pcre2-dlopen.h
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