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Jia Tan 7e884c00d0 lib: Update getopt.in.h from Gnulib with modifications.
We can still avoid modifying the contents of this file during
configuration to simplify the build systems. Gnulib added replacements
for inclusions guards for Cygwin. Cygwin should not need getopt_long
replacement so this feature can be omitted.

<unistd.h> is conditionally included to avoid MSVC since it is not
available.

The definition for _GL_ARG_NONNULL was also copied into this file from
Gnulib since this stage is usually done during gnulib-tool.
2023-09-23 03:27:00 +08:00
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