CI: Don't ignore deps directory when formatting

Also add a .clang-format ignore file to the libff dependency.

CI/check-format.sh

@@ -44,7 +44,6 @@ fi
 find . -type d \( \
     -path ./\*build -o \
     -path ./cmake -o \
-    -path ./deps -o \
     -path ./plugins/decklink/\*/decklink-sdk -o \
     -path ./plugins/enc-amf -o \
     -path ./plugins/mac-syphon/syphon-framework -o \

deps/libff/.clang-format

@@ -0,0 +1,3 @@
+Language: Cpp
+SortIncludes: false
+DisableFormat: true