gallium: remove TGSI_SEMANTIC_VERTICES

it's a leftover from an early version of geometry shading support.
geometry shaders now encode the primitive size in the PROPERTY token
and don't need special input with their size.

src/gallium/include/pipe/p_shader_tokens.h

@@ -130,9 +130,8 @@ struct tgsi_declaration_range
 #define TGSI_SEMANTIC_NORMAL    6
 #define TGSI_SEMANTIC_FACE      7
 #define TGSI_SEMANTIC_EDGEFLAG  8
-#define TGSI_SEMANTIC_VERTICES  9
-#define TGSI_SEMANTIC_PRIMID   10
-#define TGSI_SEMANTIC_COUNT    11 /**< number of semantic values */
+#define TGSI_SEMANTIC_PRIMID    9
+#define TGSI_SEMANTIC_COUNT    10 /**< number of semantic values */
 
 struct tgsi_declaration_semantic
 {