[patch] catch configure errors

[Thorsten Glaser]

Hi,

the current configure wrapper ostensibly tries to catch the
errorlevel of the configure invocation ($?) into $conf_result_code.
The problem is that it fails to do so correctly because the actual
“throw” is hidden behind both pipes and subshells.

The patch fixes this by writing it (in just another subshell, to
be able to actually do that) into a temporary file and reading it
back from there later.

Please apply,
//mirabilos
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