GraphicsDefs: Do not cast structs to integers to compare them.

That requires more padding (1 byte vs 4 or 8 depending on integer size),
so just use regular loops and chained ==s.

Caught by Clang. No functional change intended.

headers/os/interface/GraphicsDefs.h

@@ -19,9 +19,11 @@ typedef struct pattern {
 inline bool
 operator==(const pattern& a, const pattern& b)
 {
-	uint64* pa = (uint64*)a.data;
-	uint64* pb = (uint64*)b.data;
-	return (*pa == *pb);
+	for (int i = 0; i < 8; i++) {
+		if (a.data[i] != b.data[i])
+			return false;
+	}
+	return true;
 }
 
 
@@ -62,13 +64,16 @@ typedef struct rgb_color {
 	inline bool
 	operator==(const rgb_color& other) const
 	{
-		return *(const uint32 *)this == *(const uint32 *)&other;
+		return red == other.red
+			&& green == other.green
+			&& blue == other.blue
+			&& alpha == other.alpha;
 	}
 
 	inline bool
 	operator!=(const rgb_color& other) const
 	{
-		return *(const uint32 *)this != *(const uint32 *)&other;
+		return !(*this == other);
 	}
 
 	inline rgb_color&