Fix a few struct size declarations

Was wrong.  As excercised by defining VAR to other than 1 in hb.hh.

src/hb-aat-layout-feat-table.hh

@@ -206,7 +206,7 @@ struct feat
   SortedUnsizedArrayOf<FeatureName>
 		namesZ;		/* The feature name array. */
   public:
-  DEFINE_SIZE_STATIC (24);
+  DEFINE_SIZE_ARRAY (12, namesZ);
 };
 
 } /* namespace AAT */

src/hb-ot-cff-common.hh

@@ -516,7 +516,7 @@ struct FDSelect0 {
 
   HBUINT8     fds[VAR];
 
-  DEFINE_SIZE_MIN (1);
+  DEFINE_SIZE_MIN (0);
 };
 
 template <typename GID_TYPE, typename FD_TYPE>

src/hb-ot-color-sbix-table.hh

@@ -125,7 +125,7 @@ struct SBIXStrike
 		imageOffsetsZ;	/* Offset from the beginning of the strike data header
 				 * to bitmap data for an individual glyph ID. */
   public:
-  DEFINE_SIZE_STATIC (8);
+  DEFINE_SIZE_ARRAY (4, imageOffsetsZ);
 };
 
 struct sbix

src/hb-ot-layout-common.hh

@@ -540,7 +540,7 @@ struct FeatureParams
   FeatureParamsCharacterVariants	characterVariants;
   } u;
   public:
-  DEFINE_SIZE_STATIC (17);
+  DEFINE_SIZE_MIN (0);
 };
 
 struct Feature