Fix gitignore for pthread-w32 build artifacts.

Change-Id: Id071467685a2ae24840444d3caafa5fd5bb17992
diff --git a/.gitignore b/.gitignore
index e5fcd84..705a289 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,4 +30,7 @@
 Release/
 release/
 
-pthreads-*-release/
\ No newline at end of file
+pthread.obj
+pthreadVC2.exp
+pthreadVC2.lib
+pthreadVC2.map