tgsi: Remove depricated ATTRIB interpolate mode.

src/gallium/auxiliary/tgsi/util/tgsi_dump.c

@@ -119,8 +119,7 @@ static const char *TGSI_INTERPOLATES_SHORT[] =
 {
    "CONSTANT",
    "LINEAR",
-   "PERSPECTIVE",
-   "ATTRIB"
+   "PERSPECTIVE"
 };
 
 static const char *TGSI_SEMANTICS[] =

src/gallium/include/pipe/p_shader_tokens.h

@@ -75,6 +75,7 @@ enum tgsi_file_type {
 #define TGSI_INTERPOLATE_CONSTANT      0
 #define TGSI_INTERPOLATE_LINEAR        1
 #define TGSI_INTERPOLATE_PERSPECTIVE   2
+#define TGSI_INTERPOLATE_COUNT         3
 
 struct tgsi_declaration
 {