Backport #676 from trunk:
./configure expects message to be in the C locale, so force that.

/branches/1.1/configure | 6 3 3 0 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

# Compute x86_64-specific values

CT_DoArchValues() {

    # The architecture part of the tuple:

    CT_TARGET_ARCH="${CT_ARCH}"

}