configure: Remove unneeded redirections of stderr (pkg-config --cflags, --libs) For existing libraries, pkg-config --cflags and pkg-config --libs won't print error messages to stderr, so redirecting stderr is not necessary. Signed-off-by: Stefan Weil <sw@weilnetz.de> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>