Update gitignore dependency

Update the .gitignore to ignore the subproject source directories.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I195dc4536fd6c5d893e9367b2d1b64819e590897
diff --git a/.gitignore b/.gitignore
index 44bbe67..6da54be 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,3 @@
-### Meson ###
-# subproject directories
-/subprojects/*
-
-# build directory
-build*/*
+build*/
+subprojects/*
+!subprojects/*.wrap