all: fix array size data type on 64 bit

The array struct aligned size to 64 bit on x86_64 which caused bad things
to happen.

We use size_t to make sure the size element is correct regardless arch.

Solution found by Timo.

src/apk_defines.h

@@ -87,7 +87,7 @@ void *apk_array_resize(void *array, size_t new_size, size_t elem_size);
 
 #define APK_ARRAY(array_type_name, elem_type_name)			\
 	struct array_type_name {					\
-		int num;						\
+		size_t num;						\
 		elem_type_name item[];					\
 	};								\
 	static inline void						\

src/common.c

@@ -31,11 +31,11 @@ void *apk_array_resize(void *array, size_t new_size, size_t elem_size)
 	if (array == &dummy_array)
 		array = NULL;
 
-	tmp = realloc(array, sizeof(int) + new_size * elem_size);
+	tmp = realloc(array, sizeof(size_t) + new_size * elem_size);
 	if (diff > 0)
-		memset(tmp + sizeof(int) + old_size * elem_size, 0,
+		memset(tmp + sizeof(size_t) + old_size * elem_size, 0,
 		       diff * elem_size);
-	*((int*) tmp) = new_size;
+	*((size_t*) tmp) = new_size;
 
 	return tmp;
 }