lib: matcher: widen matcher type bitmask assert to 64 bits

With 30 matcher types defined, the uint32_t bitmask guard only has 2
slots remaining. Widen the static_assert to uint64_t to allow the enum
to grow beyond 32 values. BF_FLAG() already uses 1ULL, so no other
changes are needed.

Closes: #443

Author: aleivag

src/libbpfilter/include/bpfilter/matcher.h

@@ -113,9 +113,8 @@ enum bf_matcher_type
     _BF_MATCHER_TYPE_MAX,
 };
 
-/// @todo Change `bf_matcher_type` bitmasks to 64 bits.
-static_assert(_BF_MATCHER_TYPE_MAX <= 8 * sizeof(uint32_t),
-              "too many matcher types for uint32_t bitmask");
+static_assert(_BF_MATCHER_TYPE_MAX <= 8 * sizeof(uint64_t),
+              "too many matcher types for uint64_t bitmask");
 
 /**
  * Defines the structure of the payload for bf_matcher's