Removes the deprecated and removed `dvdcss_interface_2` libdvdcss function.

This does not change any functionality; it only modifies the printing of software version information.
--- a/cssdec.c
+++ b/cssdec.c
@@ -102,8 +102,8 @@ int main( int argc, char *argv[] )
 			b_keyonly = 1;
 			break;
 		case 'V':
-			printf( "%s version %s (libdvdcss version %s)\n",
-			  progname, progversion, dvdcss_interface_2 );
+			printf( "%s version %s\n",
+			  progname, progversion );
 			exit( EX_SUCCESS );
 			break;
 		case '?':
@@ -126,8 +126,8 @@ int main( int argc, char *argv[] )
 	if( argc >= 3 ) end = (int)strtol( argv[2], (char **)NULL, 0 );
 
 	/* Initialize libdvdcss */
-	printe( 2, "%s version %s (libdvdcss version %s)",
-	  progname, progversion, dvdcss_interface_2 );
+	printe( 2, "%s version %s",
+	  progname, progversion );
 	dvdcss = dvdcss_open( (char *)dvdfile );
 	if( dvdcss == NULL )
 	{
diff --git a/dvdimgdecss.c b/dvdimgdecss.c
index 0b7006d..b7d251a 100644
--- a/dvdimgdecss.c
+++ b/dvdimgdecss.c
@@ -157,8 +157,8 @@ int main( int argc, char *argv[] )
 			dvdread_decrypt = 1;
 			break;
 		case 'V':
-			printf( "%s version %s (libdvdcss version %s)\n",
-			  progname, progversion, dvdcss_interface_2 );
+			printf( "%s version %s\n",
+			  progname, progversion );
 			exit( EX_SUCCESS );
 			break;
 		case '?':
@@ -180,8 +180,8 @@ int main( int argc, char *argv[] )
 	if( !imgfile ) verbosity++;
 
 	/* Open the DVD */
-	printe( 2, "%s: version %s (libdvdcss version %s)\n",
-	  progname, progversion, dvdcss_interface_2 );
+	printe( 2, "%s: version %s\n",
+	  progname, progversion );
 	dvdcss = dvdcss_open( dvdfile );
 	if( dvdcss == NULL ) {
 		printe( 1, "opening of the DVD (%s) with libdvdcss failed\n", dvdfile );