check_spelling_c: update dictionary

check_source/check_spelling_c_config.py

@@ -42,6 +42,7 @@ dict_custom = {
     "anisotropic",
     "anisotropy",
     "atomicity",
+    "bindless",
     "bitwise",
     "blocky",
     "boolean",
@@ -267,6 +268,7 @@ dict_custom = {
     "subclassing",
     "subdirectories",
     "subdirectory",
+    "subtractive",
     "symmetrize",
     "symmetrized",
     "targetless",