add get_source.sh to .gitignore to avoid adding again after merges with mercurial repo
diff --git a/.gitignore b/.gitignore
index 1a30cb8..8f0341b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,4 +4,5 @@
 jaxws/
 jdk/
 langtools/
-nashorn/
\ No newline at end of file
+nashorn/
+get_source.sh
\ No newline at end of file