Fix missing null terminator in runtime path resolution on Linux #85350
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readlink does not null terminate the output buffer. The existing code passed the full buffer size to readlink, which did not leave any space to append a terminator.
This change passes size -1 to readlink and terminates the buffer with a '\0' after a successful read to avoid reading past the end of the buffer.
This change is consistent with the usage pattern seen in swift-foundation-icu / icuSources / common / putil.cpp