Fix the build system.

The improvements are:

- use most of the default "Makefile" for standard packaging;
- also use the default ".gitignore" with for the derived assets;
- don't impose so many $CFLAGS on the user.  GCC still needs to be given
  the `-ffreestanding` flag explicitly for us to get a good binary;
- stop using ad-hoc tools/* scripts, and avoid the code-generation
  anti-pattern overall on the build.  Some of the generated files were
  checked-in, and some were removed;
- remove empty files;
- use POSIX make(1) over gmake;
- add fuzz targets;
- partial "install" and "uninstall" targets;
- complete "clean" target.

The shortcomings are:
- only working on x86_64.  More platforms coming soon;
- code is still messy: way too many warnings, GNU/BSD specific
  extensions, inline assembly, and all kinds of unportable code;
- still only works with GCC and GCC-like compilers, and completly fails
  with tcc(1) and cproc(1);
- the `deps.mk` file is being maintained manually.  As I work on the
  source files I'll finish automating its generation with `mkdeps.sh`;
- still seems to be coupled with Linux;
- still is missing tests setup;
- still uses `#include <$NAME.h>` instead of the correct
  `#include "$NAME.h"` form.

The generated libgrovel.a did match the previous lib/libc.a 100%.

2 files changed, 34 insertions, 0 deletions

diff --git a/tests/fuzz/another.c b/tests/fuzz/another.c
new file mode 100644
index 00000000..7fbfe075
--- /dev/null
+++ b/tests/fuzz/another.c
@@ -0,0 +1,17 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+static bool
+fuzz_me(const uint8_t *const data, const size_t size) {
+	(void)data;
+	(void)size;
+	return true;
+}
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *const data, const size_t size) {
+	int rc = 0;
+	fuzz_me(data, size);
+	return rc;
+}
diff --git a/tests/fuzz/hello.c b/tests/fuzz/hello.c
new file mode 100644
index 00000000..7fbfe075
--- /dev/null
+++ b/tests/fuzz/hello.c
@@ -0,0 +1,17 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+static bool
+fuzz_me(const uint8_t *const data, const size_t size) {
+	(void)data;
+	(void)size;
+	return true;
+}
+
+int
+LLVMFuzzerTestOneInput(const uint8_t *const data, const size_t size) {
+	int rc = 0;
+	fuzz_me(data, size);
+	return rc;
+}