build: OK, maybe 32-bit machines could work

I accidentally did a pre-push verification on a 32-bit build host.
There were a surprisingly small number of problems, so fix them.

Bees now builds on a 32-bit host.  Let's not update README just yet,
though:  the 32-bit ioctl support fails immediately after startup on a
64-bit kernel.

include/crucible/fs.h

@@ -171,7 +171,7 @@ namespace crucible {
 	ostream & operator<<(ostream &os, const BtrfsIoctlSearchKey &key);
 
 	string btrfs_search_type_ntoa(unsigned type);
-	string btrfs_search_objectid_ntoa(unsigned objectid);
+	string btrfs_search_objectid_ntoa(uint64_t objectid);
 
 	uint64_t btrfs_get_root_id(int fd);
 	uint64_t btrfs_get_root_transid(int fd);

include/crucible/ntoa.h

@@ -7,12 +7,12 @@ namespace crucible {
 	using namespace std;
 
 	struct bits_ntoa_table {
-		unsigned long n;
-		unsigned long mask;
+		unsigned long long n;
+		unsigned long long mask;
 		const char *a;
 	};
 
-	string bits_ntoa(unsigned long n, const bits_ntoa_table *a);
+	string bits_ntoa(unsigned long long n, const bits_ntoa_table *a);
 
 };
 

include/crucible/timequeue.h

@@ -23,7 +23,7 @@ namespace crucible {
 	private:
 		struct Item {
 			Timestamp m_time;
-			unsigned m_id;
+			unsigned long m_id;
 			Task m_task;
 
 			bool operator<(const Item &that) const {