opencl: fix .gitignore for .install-gallium-links

Fixes: 0b6157e9713 "install-gallium-links: port changes from install-lib-links"

v2: move this to the top level .gitignore and added Fixes:
    like Emil Velikov <emil.l.velikov@gmail.com> suggested

Signed-off-by: Dieter Nützel <Dieter@nuetzel-hh.de>
Reviewed-by: Eduardo Lima Mitev <elima@igalia.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/.gitignore b/.gitignore
index 21aa35c..b4f88f7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,3 +46,4 @@
 Makefile
 Makefile.in
 .install-mesa-links
+.install-gallium-links