Fix build on NETFX

Author: maca88

src/NHibernate.Test/Async/Linq/ParameterTests.cs

@@ -125,7 +125,7 @@ public async Task UsingDifferentStringParametersAsync()
 				var matches = Regex.Matches(sqlParameters, @"([\d\w]+)[\s]+\=", RegexOptions.IgnoreCase);
 
 				// Due to ODBC drivers not supporting parameter names, we have to do a distinct of parameter names.
-				var distinctParameters = matches.Select(m => m.Groups[1].Value.Trim()).Distinct().ToList();
+				var distinctParameters = matches.OfType<Match>().Select(m => m.Groups[1].Value.Trim()).Distinct().ToList();
 				Assert.That(distinctParameters, Has.Count.EqualTo(parameterNumber));
 			}
 		}

src/NHibernate.Test/Linq/ParameterTests.cs

@@ -112,7 +112,7 @@ private static void AssertTotalParameters<T>(IQueryable<T> query, int parameterN
 				var matches = Regex.Matches(sqlParameters, @"([\d\w]+)[\s]+\=", RegexOptions.IgnoreCase);
 
 				// Due to ODBC drivers not supporting parameter names, we have to do a distinct of parameter names.
-				var distinctParameters = matches.Select(m => m.Groups[1].Value.Trim()).Distinct().ToList();
+				var distinctParameters = matches.OfType<Match>().Select(m => m.Groups[1].Value.Trim()).Distinct().ToList();
 				Assert.That(distinctParameters, Has.Count.EqualTo(parameterNumber));
 			}
 		}