Revert "ignore *.o"

This reverts commit e65e3ea.

please track .o files by name to force 'make clean' to be up to date.

.gitignore

@@ -1,4 +1,18 @@
-*.o
+mx_getopt.o
+mx_flock.o
+mx_log.o
+mx_util.o
+mxq_group.o
+mxqdump.o
+mxq_job.o
+mxqd.o
+mxqsub.o
+mxqkill.o
+test_mx_util.o
+test_mx_log.o
+test_mx_mysql.o
+mxq_log.o
+mx_mysql.o
 
 mxqsub
 mxqdump