[epiphany/mcatanzaro/pdfjs-ignore] gitignore: be stricter about ignoring build directories

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a98d4eeca6f31b1b000bf00e04ab3eeebbf8e2d4
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Apr 5 16:17:38 2021 -0500

    gitignore: be stricter about ignoring build directories
    
    Oops, we don't want to ignore changes to pdfjs/build.

 .gitignore | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 2907da99f..ae7a2de3c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,2 @@
-_build/
-build/
+/_build/
+/build/