Eliminate GCC 2 warning due to prototype not being in scope.
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@ -110,6 +110,7 @@ unsetenv(name)
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extern char **environ;
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register char **P;
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int offset;
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char *_findenv();
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while (_findenv(name, &offset)) /* if set multiple times */
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for (P = &environ[offset];; ++P)
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