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src: readlink("/proc/self/exe") -> uv_exename()

Rodrigo Muino Tomonari requested to merge github/fork/bnoordhuis/linux-thp-exepath into master

This commit also adds error handling. A THP-enabled build terminated with an out-of-memory error on a system without /proc because it cast the -1 from readlink() to size_t (i.e. ULONG_MAX) and then tried to allocate a string of that size.

Caveat emptor: this code path isn't exercised by the CI.

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