Print time_t in a portable way.

Index: tools/psl.c
--- tools/psl.c.orig
+++ tools/psl.c
@@ -290,7 +290,7 @@ int main(int argc, const char *const *argv)
 			printf("builtin exceptions: %d\n", psl_suffix_exception_count(psl));
 			printf("builtin wildcards: %d\n", psl_suffix_wildcard_count(psl));
 			printf("builtin filename: %s\n", psl_builtin_filename());
-			printf("builtin file time: %ld (%s)\n", (long) psl_builtin_file_time(), time2str(psl_builtin_file_time()));
+			printf("builtin file time: %lld (%s)\n", (long long)psl_builtin_file_time(), time2str(psl_builtin_file_time()));
 			printf("builtin SHA1 file hash: %s\n", psl_builtin_sha1sum());
 			printf("builtin outdated: %d\n", psl_builtin_outdated());
 		} else