add bandand/or/eor to the cpp binding

oops, they had been dropped

thanks clcaalu

see https://github.com/libvips/libvips/issues/1165

ChangeLog

@@ -5,6 +5,7 @@
 - deprecate thumbnail auto_rotate, add no_rotate [jcupitt]
 - implement thumbnail shrink-on-load for openslide images [jcupitt]
 - revise vips_cast() to improve behaviour with uint images [erdmann]
+- add bandand()/or()/eor() to cplusplus binding [clcaalu]
 
 23/9/18 started 8.7.1
 - update function list in docs [janko-m] 

cplusplus/include/vips/VImage8.h

@@ -628,6 +628,24 @@ public:
 		return( round( VIPS_OPERATION_ROUND_RINT, options ) ); 
 	}
 
+	VImage 
+	bandand( VOption *options = 0 ) const
+	{
+		return( bandbool( VIPS_OPERATION_BOOLEAN_AND, options ) ); 
+	}
+
+	VImage 
+	bandor( VOption *options = 0 ) const
+	{
+		return( bandbool( VIPS_OPERATION_BOOLEAN_OR, options ) ); 
+	}
+
+	VImage 
+	bandeor( VOption *options = 0 ) const
+	{
+		return( bandbool( VIPS_OPERATION_BOOLEAN_EOR, options ) ); 
+	}
+
 	VImage 
 	real( VOption *options = 0 ) const
 	{