test: Split cppcheck and clang-tidy tests into different files

Both clang-tidy and cppcheck linting are handled by the same test file,
test/build/static_checkers.  The two linters are independent of each other
though, and each one takes quite a long time.  Split them into separate
files to make it easier to control which are executed from the top level
test script.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

test/build/clang_tidy

@@ -11,10 +11,7 @@
 # Copyright (c) 2021 Red Hat GmbH
 # Author: Stefano Brivio <sbrivio@redhat.com>
 
-htools	clang-tidy cppcheck
+htools	clang-tidy
 
 test	Run clang-tidy
 host	make clang-tidy
-
-test	Run cppcheck
-host	make cppcheck

test/build/cppcheck

@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+#
+# PASST - Plug A Simple Socket Transport
+#  for qemu/UNIX domain socket mode
+#
+# PASTA - Pack A Subtle Tap Abstraction
+#  for network namespace/tap device mode
+#
+# test/build/cppcheck - Run source through cppcheck(1) linter
+#
+# Copyright (c) 2021 Red Hat GmbH
+# Author: Stefano Brivio <sbrivio@redhat.com>
+
+htools	cppcheck
+
+test	Run cppcheck
+host	make cppcheck

test/run

@@ -61,7 +61,8 @@ run() {
 
 	setup build
 	test build/all
-	test build/static_checkers
+	test build/cppcheck
+	test build/clang_tidy
 	test distro/debian
 	test distro/fedora
 	test distro/opensuse