[openwrt/openwrt] gitignore: add .ccache folder

[LEDE Commits]

xback pushed a commit to openwrt/openwrt.git, branch openwrt-19.07:
https://git.openwrt.org/ec76c365c1d60bf6a4f69b1ab3ce132f97f34dbb

commit ec76c365c1d60bf6a4f69b1ab3ce132f97f34dbb
Author: Koen Vandeputte <koen.vandeputte at ncentric.com>
AuthorDate: Mon Jun 7 11:20:35 2021 +0200

    gitignore: add .ccache folder
    
    Signed-off-by: Koen Vandeputte <koen.vandeputte at ncentric.com>
---
 .gitignore | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.gitignore b/.gitignore
index 6549af83be..b6bfe1a525 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,3 +28,4 @@ TAGS*~
 git-src
 .project
 .cproject
+.ccache