Fix a problem in vasprintf (reported by vodz a while back) when built without custom stream support.  In that case, it is necessary to do a va_copy.  Note: The affected code is not built in the stock config. Also, make sure each va_copy has a matching va_end, as required by C99.
Fix a problem in vasprintf (reported by vodz a while back) when built
without custom stream support.  In that case, it is necessary to do
a va_copy.  Note: The affected code is not built in the stock config.
Also, make sure each va_copy has a matching va_end, as required by C99.

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc