Fixed ASTVisitor.VisitUnsupportedType to be virtual.
Fixed ASTVisitor.VisitUnsupportedType to be virtual.

mohtamohit/CppSharp,mono/CppSharp,zillemarco/CppSharp,ktopouzi/CppSharp,zillemarco/CppSharp,u255436/CppSharp,mono/CppSharp,ddobrev/CppSharp,genuinelucifer/CppSharp,ktopouzi/CppSharp,ddobrev/CppSharp,inordertotest/CppSharp,inordertotest/CppSharp,ktopouzi/CppSharp,ktopouzi/CppSharp,u255436/CppSharp,zillemarco/CppSharp,inordertotest/CppSharp,u255436/CppSharp,mono/CppSharp,mono/CppSharp,genuinelucifer/CppSharp,mohtamohit/CppSharp,mohtamohit/CppSharp,u255436/CppSharp,genuinelucifer/CppSharp,ddobrev/CppSharp,inordertotest/CppSharp,mono/CppSharp,zillemarco/CppSharp,ddobrev/CppSharp,mono/CppSharp,mohtamohit/CppSharp,u255436/CppSharp,genuinelucifer/CppSharp,mohtamohit/CppSharp,ddobrev/CppSharp,ktopouzi/CppSharp,inordertotest/CppSharp,zillemarco/CppSharp,genuinelucifer/CppSharp