remove 1-ary path in VipsLinear

the many-constant path is no slower, just keep that

TODO

@@ -1,56 +1,4 @@
 
-
-- do clip etc. in new style, good to get everything that VipsAdd uses in
-  the new stack
-
-  insert* needs im_black()
-
-  can we move everything to new-style ops now?
-
-- what's the performance hit for removing the 1ary lintra path?
-
-
-
-
-- try:
-
-	$ vips insert Gugg_coloured.jpg x.jpg x.v 100 100 --expand --background "1 2 3"
-
-  often gets the BG colour wrong, eg. notworking:
-
-$ vips insert Gugg_coloured.jpg x.jpg x.v 100 100 --expand --background "1 2 3"
-vips__vector_to_ink: starting
-vips_cast_build: 0xbff920
-vips_cast_build: 0xbff920 done
-vips_cast_gen: 0xbff920
-vips__vector_to_ink: ink = 0xc1c660 (1 2 3)
-
-  vs. working:
-
-$ vips insert Gugg_coloured.jpg x.jpg x.v 100 100 --expand --background "1 2 3"
-vips__vector_to_ink: starting
-vips_cast_build: 0x1760920
-vips_cast_build: 0x1760920 done
-vips__vector_to_ink: ink = 0x177d660 (0 0 0)
-
-  vips_cast_gen() is never called???
-
-  vips__vector_to_ink() breakage something to do with the new bandjoin thing?
-
-  strange, seems to work on laptop, try again on desktop
-
-
-
-
-
-
-
-
-
-
-
-
-
 - bandalike: consider RGB + RGBA ... we should bandup by adding a black band
 
   (or white?? unclear)

libvips/arithmetic/linear.c

@@ -37,6 +37,7 @@
  * 	- remove liboil
  * 31/10/11
  * 	- rework as a class
+ * 	- removed the 1-ary constant path, no faster
  */
 
 /*

libvips/conversion/insert.c

@@ -57,8 +57,8 @@
  */
 
 /*
- */
 #define VIPS_DEBUG
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
@@ -268,7 +268,7 @@ vips__vector_to_ink( const char *domain, VipsImage *im, double *vec, int n )
 
 #ifdef VIPS_DEBUG
 {
-	PEL *p = t[3]->data;
+	PEL *p = (PEL *) (t[3]->data);
 
 	printf( "vips__vector_to_ink: ink = %p (%d %d %d)\n",
 		p, p[0], p[1], p[2] );