Gawain: append XXX to PRIM_QUADS to make it scary

Quads are not part of modern GL or Vulkan, so we should avoid them. XXX makes coders think "hmm how could I draw this without using quads?"

Quads will be removed during the transition to core profile.

Part of T49043

intern/gawain/gawain/primitive.h

@@ -19,7 +19,7 @@ typedef enum {
 	PRIM_TRIANGLES = GL_TRIANGLES,
 
 #ifdef WITH_GL_PROFILE_COMPAT
-	PRIM_QUADS = GL_QUADS, // legacy GL has this, modern GL & Vulkan do not
+	PRIM_QUADS_XXX = GL_QUADS, // legacy GL has this, modern GL & Vulkan do not
 #endif
 
 	PRIM_LINE_STRIP = GL_LINE_STRIP,

intern/gawain/src/immediate.c

@@ -168,7 +168,7 @@ static bool vertex_count_makes_sense_for_primitive(unsigned vertex_ct, Primitive
 		case PRIM_TRIANGLE_FAN:
 			return vertex_ct >= 3;
   #ifdef WITH_GL_PROFILE_COMPAT
-		case PRIM_QUADS:
+		case PRIM_QUADS_XXX:
 			return vertex_ct % 4 == 0;
   #endif
 		default:

intern/gawain/src/primitive.c

@@ -25,7 +25,7 @@ PrimitiveClass prim_class_of_type(PrimitiveType prim_type)
 		[PRIM_TRIANGLE_FAN] = PRIM_CLASS_SURFACE,
 
 #ifdef WITH_GL_PROFILE_COMPAT
-		[PRIM_QUADS] = PRIM_CLASS_SURFACE,
+		[PRIM_QUADS_XXX] = PRIM_CLASS_SURFACE,
 #endif
 		};