clang-format: update to OpenBMC latest

Ignore libmapper, because it is written in C and the CPP style
guidelines are not appropriate.

Ignore subprojects; they can validate their formatting themselves.

Change-Id: Id88dcc49f4176c6443e7f53ca193ca8f3e83a51f
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/.gitignore b/.gitignore
index 6da54be..0eb2499 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 build*/
 subprojects/*
 !subprojects/*.wrap
+!subprojects/.clang-format
+