Excluded shared objects (.so.MAJOR.MINOR) from git tracking.

Former-commit-id: f71b7116d12910ca2cc34f5310717e3c3e520614

.gitignore

@@ -1,6 +1,9 @@
 # use glob syntax.
 syntax: glob
 scripts/change_name.sh
+*.so
+*.so.[0123456789]
+*.so.[0123456789].[0123456789]
 *.o
 *.a
 *.dylib