.gitignore: add wayland-egl-abi-check

Instruct git go ignore the file, in case we've done an in-tree build.

Cc: Derek Foreman <derekf@osg.samsung.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
diff --git a/.gitignore b/.gitignore
index 8da9861..eadea12 100644
--- a/.gitignore
+++ b/.gitignore
@@ -43,5 +43,6 @@
 Makefile.in
 exec-fd-leak-checker
 fixed-benchmark
+/wayland-egl-abi-check
 /wayland-scanner
 protocol/*.[ch]