cosmetics: improve wording of a couple of configure messages * configure.ac: Fix a couple of messages so that the configure output changes from this: checking whether /bin/sh "set -e" preserves exit traps... yes checking whether /bin/sh "set -x" corrupts stderr... no to this: checking whether /bin/sh preserves exit traps with "set -e"... yes checking whether /bin/sh corrupts stderr with "set -x"... no Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>