add std::string SharedLibrary::prefix() for building library name that

complies with Cygwin standard.

Signed-off-by: FrancisANDRE <zosrothko@orange.fr>

Foundation/src/SharedLibrary_VX.cpp

@@ -128,6 +128,12 @@ const std::string& SharedLibraryImpl::getPathImpl() const
 }
 
 
+std::string SharedLibraryImpl::prefixImpl()
+{
+	return "";
+}
+
+
 std::string SharedLibraryImpl::suffixImpl()
 {
 	return ".out";