gitignore: add .cache.mk

This seems to be generated by newer kernels when building,
add it to the gitignore.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/backport/.gitignore b/backport/.gitignore
index 43a3d08af3f24fc2c5963414d83438b976019666..c6cf6ce3c1d5d9272184f0a0c7a57a86cbdae3d8 100644 (file)
--- a/backport/.gitignore
+++ b/backport/.gitignore
@@ -19,3 +19,4 @@ kconf/conf
 .tmp_versions
 Module.symvers
 *.mod.c
+.cache.mk