Remove unused NH21 build condition (#673)

+semver:patch

Author: hazzik

src/FluentNHibernate/Cfg/Db/SQLAnywhereConfiguration.cs

@@ -7,20 +7,14 @@ public class SQLAnywhereConfiguration : PersistenceConfiguration<SQLAnywhereConf
 {
     protected SQLAnywhereConfiguration()
     {
-#if NH21
-            Driver<ASA10ClientDriver>();
-#else
         Driver<SybaseSQLAnywhereDriver>();
-#endif
     }
 
     public static SQLAnywhereConfiguration SQLAnywhere9 => new SQLAnywhereConfiguration().Dialect<SybaseASA9Dialect>();
 
-#if !NH21
     public static SQLAnywhereConfiguration SQLAnywhere10 => new SQLAnywhereConfiguration().Dialect<SybaseSQLAnywhere10Dialect>();
 
     public static SQLAnywhereConfiguration SQLAnywhere11 => new SQLAnywhereConfiguration().Dialect<SybaseSQLAnywhere11Dialect>();
-#endif
 
     public static SQLAnywhereConfiguration SQLAnywhere12 => new SQLAnywhereConfiguration().Dialect<SybaseSQLAnywhere12Dialect>().Driver<SybaseSQLAnywhereDotNet4Driver>();
 

src/FluentNHibernate/Cfg/FluentConfiguration.cs

@@ -40,10 +40,6 @@ internal FluentConfiguration()
     internal FluentConfiguration(Configuration cfg)
     {
         this.Configuration = cfg;
-
-#if NH21
-            this.ProxyFactoryFactory(DefaultProxyFactoryFactoryClassName);
-#endif
     }
 
     internal Configuration Configuration { get; }