Fixed VC7.1-STLport config setup so it works with /Zc:wchar_t

Re-ordered code in static_mutex.hpp to satisfy SGI IRIX.
Added some additional #includes to satisfy SGI Irix.
Fixed strange bug where some non-greedy repeats could repeat more times than permitted.
Fixed return value from basic_regex<>::empty().
Fixed return value from basic_regex<>::expression() and basic_regex<>::size() when the expression is invalid.


[SVN r30604]

include/boost/regex/v4/fileiter.hpp

@@ -61,6 +61,7 @@ typedef HANDLE _fi_find_handle;
 
 #elif defined(BOOST_REGEX_FI_POSIX_DIR)
 
+#include <cstddef>
 #include <cstdio>
 #include <cctype>
 #include <iterator>