use gnulib to provide the newest implementation of getopt_long()#25

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mywave82 wants to merge 2 commits intoadplug:masterfrom mywave82:gnulib

+9,406-1,431

Commits on Apr 3, 2023

config.h generated by autoheader should be included directly by the .cc files on not .h files, since it by default does not contain any guards.
mywave82
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Use gnulib to provide getopt_long()
mywave82
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