Cleanup: make hash sizes static, remove references to smallhash

Remove BLI_ghash_hash_sizes declaration it's only user (smallhash)
has been removed.

source/blender/blenlib/intern/BLI_ghash.c

@@ -36,13 +36,11 @@
 /**
  * Next prime after `2^n` (skipping 2 & 3).
  */
-extern const uint BLI_ghash_hash_sizes[]; /* Quiet warning, this is only used by smallhash.c */
-const uint BLI_ghash_hash_sizes[] = {
+static const uint hashsizes[] = {
     5,       11,      17,      37,      67,       131,      257,      521,       1031,
     2053,    4099,    8209,    16411,   32771,    65537,    131101,   262147,    524309,
     1048583, 2097169, 4194319, 8388617, 16777259, 33554467, 67108879, 134217757, 268435459,
 };
-#define hashsizes BLI_ghash_hash_sizes
 
 #ifdef GHASH_USE_MODULO_BUCKETS
 #  define GHASH_MAX_SIZE 27

source/blender/editors/mesh/editmesh_knife.cc

@@ -3022,7 +3022,7 @@ static void knife_find_line_hits(KnifeTool_OpData *kcd)
     else {
       /* This vertex isn't used so remove from `kfvs`.
        * This is useful to detect KnifeEdges that can be skipped.
-       * And it optimizes smallhash_iternext a little bit. */
+       * And it optimizes iteration a little bit. */
       kfvs.remove(v);
     }
   }