[gnome-music/wip/mschraal/gitignore-add-builddir] gitignore: Add _build

[Marinus Schraal <mschraal src gnome org>]

commit f2a3962184fd9435c21a1073769146c65b7f5e97
Author: Marinus Schraal <mschraal gnome org>
Date:   Mon Sep 24 11:09:46 2018 +0200

    gitignore: Add _build
    
    This is suggested as the default meson builddir as well as used by
    gnome-builder.

 .gitignore | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitignore b/.gitignore
index 7200d973..c92035b3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,6 +24,7 @@ subprojects/libgd/
 /Makefile
 /Makefile.in
 /TAGS
+/_build
 /_libs
 /aclocal.m4
 /autom4te.cache