[Fedora-packaging] messages printed by ./configure are reordered by mock in build.log

[Basin Ilya]

Hi.

I tried to compare build.log from running mock with the output from
directly running rpmbuild.

rpmbuild:

    checking how to run the C preprocessor... gcc -E
    checking for an ANSI C-conforming const... yes
    checking for inline... inline

build.log:

    checking how to run the C preprocessor... yes
    checking for an ANSI C-conforming const... gcc -E
    yes
    checking for inline... checking for grep that handles long lines and
-e... /usr/bin/grep
    checking for egrep... /usr/bin/grep -E
    checking for ANSI C header files... inline


It looks like mock is forcibly redirecting stdout and stderr through two
different pipes and a race condition happens.

The problem is the same as in many IDEs.

Please, please, make this redirection optional.