clang-ignore: rename

Currently openbmc-build-scripts will accept either .clang-ignore
or .clang-format-ignore.  Meson by default looks at the
.clang-format-ignore name.  Switch to using that one for broader
compatibility.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ic215763d4197dc6d5f598737dbae902d4d23f44d
diff --git a/.clang-ignore b/.clang-format-ignore
similarity index 100%
rename from .clang-ignore
rename to .clang-format-ignore