build: Replace `make config` with a `./configure` script

This lets us do more traditional out-of-tree builds like

    $ ../path/to/bfs/configure
    $ make

The .mk files are moved from ./config to ./build, mostly so that
./configure will auto-complete easily.

5 files changed, 45 insertions, 0 deletions

diff --git a/build/use/libacl.c b/build/use/libacl.c
new file mode 100644
index 0000000..de1fe50
--- /dev/null
+++ b/build/use/libacl.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+#include <sys/acl.h>
+
+int main(void) {
+	acl_free(0);
+	return 0;
+}
diff --git a/build/use/libcap.c b/build/use/libcap.c
new file mode 100644
index 0000000..58e832c
--- /dev/null
+++ b/build/use/libcap.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+#include <sys/capability.h>
+
+int main(void) {
+	cap_free(0);
+	return 0;
+}
diff --git a/build/use/libselinux.c b/build/use/libselinux.c
new file mode 100644
index 0000000..bca409d
--- /dev/null
+++ b/build/use/libselinux.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+#include <selinux/selinux.h>
+
+int main(void) {
+	freecon(0);
+	return 0;
+}
diff --git a/build/use/liburing.c b/build/use/liburing.c
new file mode 100644
index 0000000..bea499a
--- /dev/null
+++ b/build/use/liburing.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+#include <liburing.h>
+
+int main(void) {
+	io_uring_free_probe(0);
+	return 0;
+}
diff --git a/build/use/oniguruma.c b/build/use/oniguruma.c
new file mode 100644
index 0000000..cb17596
--- /dev/null
+++ b/build/use/oniguruma.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+#include <oniguruma.h>
+
+int main(void) {
+	onig_free(0);
+	return 0;
+}