Made sure to run configure in a "C" locale.

Otherwise, we may fail to properly detect a version of compiler.

auto/configure

diff --git a/auto/configure b/auto/configure
index 45ea154..d7d8189 100755
--- a/auto/configure
+++ b/auto/configure
@@ -4,6 +4,9 @@
 # Copyright (C) Nginx, Inc.
 
 
+LC_ALL=C
+export LC_ALL
+
 . auto/options
 . auto/init
 . auto/sources