Optimized the from_stream_type function. In case if no locales support available the code was modified to fix possible character code truncation. Related to #287.

[SVN r53529]

libs/date_time

@@ -1 +1 @@
-Subproject commit 8e9f05161de760a0a96b6d6c2e2c92d25d1052e5
+Subproject commit 3e558911e4f384aeb1bcee865742fc77e3193bc1