Make sure formatting scripts respect git ignored files

Even for files ignored with a global .gitignore or through
`.git/info/exclude`

Author: Luthaf

scripts/check-format.sh

@@ -5,12 +5,4 @@ set -eu
 ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")"/.. && pwd)
 cd "$ROOT_DIR"
 
-find . -type f \(                            \
-        -name "*.c" -o -name "*.cpp"         \
-        -o -name "*.h" -o -name "*.hpp"      \
-        -o -name "*.cu" -o -name "*.cuh"     \
-    \)                                       \
-    -not -path "*/external/*"                \
-    -not -path "*/build/*"                   \
-    -not -path "*/.tox/*"                    \
-    -exec clang-format --dry-run --Werror {} \;
+git ls-files '*.cpp' '*.c' '*.hpp' '*.h' '*.cu' '*.cuh' | xargs -L 1 clang-format --dry-run --Werror

scripts/format.sh

@@ -5,12 +5,4 @@ set -eu
 ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")"/.. && pwd)
 cd "$ROOT_DIR"
 
-find . -type f \(                            \
-        -name "*.c" -o -name "*.cpp"         \
-        -o -name "*.h" -o -name "*.hpp"      \
-        -o -name "*.cu" -o -name "*.cuh"     \
-    \)                                       \
-    -not -path "*/external/*"                \
-    -not -path "*/build/*"                   \
-    -not -path "*/.tox/*"                    \
-    -exec clang-format -i {} \;
+git ls-files '*.cpp' '*.c' '*.hpp' '*.h' '*.cu' '*.cuh' | xargs -L 1 clang-format -i