[all] Reference headers in src instead of copying

This is the second of two big changes to clean up includes throughout
the project. Since I've started using clangd with Neovim and using
VSCode's intellisense, my former strategy of copying all header files
into place in `build/include` means that the real files don't show up in
`compile_commands.json` and so display many include errors when viewing
those header files in those tools.

That setup was mostly predicated on a desire to keep directory depths
small, but really I don't think paths like `src/libraries/j6/j6` are
much better than `src/libraries/j6/include/j6`, and the latter doesn't
have the aforementioned issues, and is clearer to the casual observer as
well.

Some additional changes:

- Added a new module flag `copy_headers` for behavior similar to the old
  style, but placing headers in `$module_dir/include` instead of the
  global `build/include`. This was needed for external projects that
  don't follow the same source/headers folder structure - in this case,
  `zstd`.
- There is no longer an associated `headers.*.ninja` for each
  `module.*.ninja` file, as only parsed headers need to be listed; this
  functionality has been moved back into the module's ninja file.

src/libraries/libc_free/include/stdint.h.cog

@@ -0,0 +1,68 @@
+#pragma once
+/** \file stdint.h
+  * Fixed-width integer types
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+/**[[[cog code generation
+import cog
+from j6libc import definition, int_widths, int_mods
+
+for width in int_widths:
+    definition("typedef", f"__INT{width}_TYPE__",  f"int{width}_t;")
+    definition("#define", f"INT{width}_WIDTH",     f"{width}")
+    definition("#define", f"INT{width}_MAX",       f"__INT{width}_MAX__")
+    definition("#define", f"INT{width}_MIN",       f"((-__INT{width}_MAX__) - 1)")
+    definition("#define", f"INT{width}_C( x )",    f"x ## __INT{width}_C_SUFFIX__")
+
+    cog.outl()
+    definition("typedef", f"__UINT{width}_TYPE__", f"uint{width}_t;")
+    definition("#define", f"UINT{width}_WIDTH",    f"{width}")
+    definition("#define", f"UINT{width}_MAX",      f"__UINT{width}_MAX__")
+    definition("#define", f"UINT{width}_C( x )",   f"x ## __UINT{width}_C_SUFFIX__")
+
+    for mod in int_mods:
+        cog.outl()
+        definition("typedef", f"__INT_{mod.upper()}{width}_TYPE__",  f"int_{mod}{width}_t;")
+        definition("typedef", f"__UINT_{mod.upper()}{width}_TYPE__", f"uint_{mod}{width}_t;")
+        definition("#define", f"INT_{mod.upper()}{width}_WIDTH",     f"{width}")
+        definition("#define", f"INT_{mod.upper()}{width}_MAX",       f"__INT_{mod.upper()}{width}_MAX__")
+        definition("#define", f"INT_{mod.upper()}{width}_MIN",       f"((-__INT_{mod.upper()}{width}_MAX) - 1)")
+
+        cog.outl()
+        definition("typedef", f"__UINT_{mod.upper()}{width}_TYPE__", f"uint_least{width}_t;")
+        definition("#define", f"UINT_{mod.upper()}{width}_WIDTH",    f"{width}")
+        definition("#define", f"UINT_{mod.upper()}{width}_MAX",      f"__UINT_{mod.upper()}{width}_MAX__")
+
+    cog.outl()
+
+]]]*/
+/*[[[end]]]*/
+
+typedef __INTMAX_TYPE__          intmax_t;
+#define INTMAX_WIDTH             __INTMAX_WIDTH__
+#define INTMAX_MAX               __INTMAX_MAX__
+#define INTMAX_MIN               ((-__INTMAX_MAX__) - 1)
+#define INTMAX_C( x )            x ## __INTMAX_C_SUFFIX__
+
+typedef __UINTMAX_TYPE__         uintmax_t;
+#define UINTMAX_WIDTH            __UINTMAX_WIDTH__
+#define UINTMAX_MAX              __UINTMAX_MAX__
+#define UINTMAX_C( x )           x ## __UINTMAX_C_SUFFIX__
+
+typedef __INTPTR_TYPE__          intptr_t;
+#define INTPTR_WIDTH             __INTPTR_WIDTH__
+#define INTPTR_MAX               __INTPTR_MAX__
+#define INTPTR_MIN               ((-__INTPTR_MAX__) - 1)
+
+typedef __UINTPTR_TYPE__         uintptr_t;
+#define UINTPTR_WIDTH            __UINTPTR_WIDTH__
+#define UINTPTR_MAX              __UINTPTR_MAX__
+
+/* vim: set ft=c: */