intel: fix compiler build

compiler/brw_vec4_gs_visitor.cpp:744:39: error:
‘GEN7_MAX_GS_OUTPUT_VERTEX_SIZE_BYTES’ was not declared in this scope
           output_vertex_size_bytes <= GEN7_MAX_GS_OUTPUT_VERTEX_SIZE_BYTES);

Fixes: d0d4a5f43b ("i965: split EU defines to brw_eu_defines.h")
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

src/intel/compiler/brw_eu_defines.h

@@ -1240,6 +1240,13 @@ enum brw_message_target {
 
 /* GS Thread Payload
  */
+
+/* 3DSTATE_GS "Output Vertex Size" has an effective maximum of 62. It's
+ * counted in multiples of 16 bytes.
+ */
+#define GEN7_MAX_GS_OUTPUT_VERTEX_SIZE_BYTES            (62*16)
+
+
 /* R0 */
 # define GEN7_GS_PAYLOAD_INSTANCE_ID_SHIFT		27