detect: remove struct/union tricks from Signature

src/detect.h

@@ -366,30 +366,19 @@ typedef struct SigMatchData_ {
 
 /** \brief Signature container */
 typedef struct Signature_ {
-    union {
-        struct {
     /* coccinelle: Signature:flags:SIG_FLAG */
     uint32_t flags;
+
     AppProto alproto;
+
     uint16_t dsize_low;
-        };
-        uint64_t hdr_copy1;
-    };
-    union {
-        struct {
     uint16_t dsize_high;
+
     uint16_t mpm_pattern_id_div_8;
-        };
-        uint32_t hdr_copy2;
-    };
-    union {
-        struct {
     uint8_t mpm_pattern_id_mod_8;
+
     SignatureMask mask;
     SigIntId num; /**< signature number, internal id */
-        };
-        uint32_t hdr_copy3;
-    };
 
     /** inline -- action */
     uint8_t action;