clang-ignore: remove unneeded file

openbmc-build-scripts by default uses git-ls-files and so does meson.
There is no reason to add untracked files into the .clang-ignore.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ifdc7e233df81e5f5dd37ec170db9820fdd784ae0
diff --git a/.clang-ignore b/.clang-ignore
deleted file mode 100644
index 9376935..0000000
--- a/.clang-ignore
+++ /dev/null
@@ -1,13 +0,0 @@
-./boost-src
-./Boost-prefix
-./CMakeFiles
-./boost-src
-./nlohmann-json-prefix
-./nlohmann-json-src
-./nlohmann
-./prefix
-./sdbusplus-project
-./sdbusplus-src
-./valijson-prefix
-./valijson-src
-./valijson