Disabled workarounds for SGI compiler - they don't work and shouldn't be needed.

Removed local declaration of icase, when class member should do.


[SVN r19085]

include/boost/regex/config/cstring.hpp

@@ -25,6 +25,7 @@
 
 #include <cstring>
 #include <cctype>
+#ifndef __sgi
 #ifdef __KCC
 #include <ios>
 #endif
@@ -226,4 +227,6 @@ using ::toupper;
 
 } // namespace std
 
+#endif // __sgi
+
 #endif