scripting: report dlerror() output

dlopen() and dlsym() can fail in various ways, and we can find out
how it failed by calling dlerror(). This is particularly useful if
you typo the filename of a script when explicitly passing it with
--script, and dlopen actually tells you that the file doesn't exist
instead of leading you down a rabbit hole of disassembling your
shared object file to figure out why the thing won't load.

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