Fix for time_t != long

`time_t` may not be `long`, for examples, unsigned (long) int,
long long int (64bit integer type on 32bit arch), double, and so on.

Change to use difftime(3) to retrieve seconds.

Signed-off-by: OBATA Akio <obache@wizdas.com>
(cherry picked from commit 9b8b7c1299)

arts/runtime/artsbuilderloader_impl.cc

@@ -247,7 +247,7 @@ public:
 			if( stat(filename.c_str(), &st) == 0 )
 			{
 				char mtime[32];
-				sprintf(mtime,"[%ld]",st.st_mtime);
+				snprintf(mtime,sizeof(mtime),"[%.0f]",difftime(st.st_mtime, (time_t)0));
 				result += filename + mtime;
 			}
 			else

kscd/libwm/database.c

@@ -1107,11 +1107,11 @@ load( void )
 /* This is some kind of profiling code. I don't change it
    to wm_lib_message() for now... */
 #ifndef NDEBUG
-	long		t1, t2;
+	time_t		t1, t2;
 	if( getenv( "WORKMAN_DEBUG" ) != NULL )
 	  {
 		time(&t1);
-		printf("%s (%d): search start = %ld\n", __FILE__, __LINE__, t1);
+		printf("%s (%d): search start = %.0f\n", __FILE__, __LINE__, difftime(t1, (time_t)0));
         fflush(stdout);
 	  }	
 #endif
@@ -1158,7 +1158,7 @@ load( void )
 	if( getenv( "WORKMAN_DEBUG" ) != NULL )
 	  {
 		time(&t2);
-		printf("%s (%d): db search end = %ld, elapsed = %ld\n", __FILE__, __LINE__, t2, t2 - t1);
+		printf("%s (%d): db search end = %.0f, elapsed = %.0f\n", __FILE__, __LINE__, difftime(t2, (time_t)0), difftime(t2, t1));
 		fflush(stdout);
 	  }	
 #endif
@@ -1192,7 +1192,7 @@ load( void )
 	if( getenv( "WORKMAN_DEBUG" ) != NULL )
 	  {
 		time(&t2);
-		printf("%s (%d): search end = %ld, elapsed = %ld\n", __FILE__, __LINE__, t2, t2 - t1);
+		printf("%s (%d): search end = %.0f, elapsed = %.0f\n", __FILE__, __LINE__, difftime(t2, (time_t)0), difftime(t2, t1));
 		fflush(stdout);
 	  }	
 #endif