[recipes/meson2] meson: Add .gitignore for meson-managed directories

[Matthias Clasen <matthiasc src gnome org>]

commit f5341ff82113720eb786cc78829bfff12a96c3b1
Author: Nirbheek Chauhan <nirbheek centricular com>
Date:   Sat Feb 18 22:54:04 2017 +0530

    meson: Add .gitignore for meson-managed directories

 .gitignore |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c4c1443
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+build/
+subprojects/libgd/