Cleanup: Use DNA deprecated guards around old flags

These flags shouldn't be used except in versioning code.

source/blender/makesdna/DNA_constraint_types.h

@@ -690,8 +690,10 @@ typedef enum eBConstraint_Types {
 /* flag 0x20 (1 << 5) was used to indicate that a constraint was evaluated
  *                  using a 'local' hack for posebones only. */
 typedef enum eBConstraint_Flags {
+#ifdef DNA_DEPRECATED_ALLOW
   /* Expansion for old box constraint layouts. Just for versioning. */
   CONSTRAINT_EXPAND_DEPRECATED = (1 << 0),
+#endif
   /* pre-check for illegal object name or bone name */
   CONSTRAINT_DISABLE = (1 << 2),
   /* to indicate which Ipo should be shown, maybe for 3d access later too */

source/blender/makesdna/DNA_gpencil_modifier_types.h

@@ -57,7 +57,9 @@ typedef enum GpencilModifierMode {
   eGpencilModifierMode_Realtime = (1 << 0),
   eGpencilModifierMode_Render = (1 << 1),
   eGpencilModifierMode_Editmode = (1 << 2),
+#ifdef DNA_DEPRECATED_ALLOW
   eGpencilModifierMode_Expanded_DEPRECATED = (1 << 3),
+#endif
   eGpencilModifierMode_Virtual = (1 << 4),
 } GpencilModifierMode;
 

source/blender/makesdna/DNA_modifier_types.h

@@ -106,8 +106,10 @@ typedef enum ModifierMode {
   eModifierMode_Render = (1 << 1),
   eModifierMode_Editmode = (1 << 2),
   eModifierMode_OnCage = (1 << 3),
-  /* Old modifier box expansion, just for versioning. */
+#ifdef DNA_DEPRECATED_ALLOW
+  /** Old modifier box expansion, just for versioning. */
   eModifierMode_Expanded_DEPRECATED = (1 << 4),
+#endif
   eModifierMode_Virtual = (1 << 5),
   eModifierMode_ApplyOnSpline = (1 << 6),
   eModifierMode_DisableTemporary = (1u << 31),

source/blender/makesdna/DNA_shader_fx_types.h

@@ -49,7 +49,9 @@ typedef enum ShaderFxMode {
   eShaderFxMode_Realtime = (1 << 0),
   eShaderFxMode_Render = (1 << 1),
   eShaderFxMode_Editmode = (1 << 2),
+#ifdef DNA_DEPRECATED_ALLOW
   eShaderFxMode_Expanded_DEPRECATED = (1 << 3),
+#endif
 } ShaderFxMode;
 
 typedef enum {