Adds a system-provided checkmake hook for pre-commit

[Problems with pre-commit's invocation of `go install`][pc-gh2722] had me wanting more options for how to run hooks in case the automated installation fails. Since checkmake is available in at least Homebrew, it'd be nice to have a hook that can use a checkmake executable already installed in the system PATH.

[pc-gh2722]: pre-commit/pre-commit#2722

.pre-commit-hooks.yaml

@@ -4,3 +4,9 @@
     language: golang
     pass_filenames: true
     types: [makefile]
+-   id: checkmake-system
+    name: Makefile linter/analyzer
+    entry: checkmake
+    language: system
+    types: [makefile]
+    pass_filenames: true