Modified wide character tests to warn not fail when no wide character support is available in the platform.

Modified Jamfiles to use centralised options.
Added wide character concept check.


[SVN r19318]

libs/regex

@@ -1 +1 @@
-Subproject commit 9d565f63ed91652530cad30f0fcbaea7498a5b44
+Subproject commit 6750cf4892b18606660003d5397076f8f1feea5e