meta: replace cmake mono-build system with a custom build co-ordinator

every system component now has its own self-contained build system, and a
seed file describing the component and its build system and dependencies.

a new tool, meadow, collects and uses these seed files to build the
components into a full system. meadow also manages the target system root
and a host prefix where toolchain tools are installed to.

the build system has also been updated to use a new $ARCH-rosetta-gcc
compiler, and the patches files necessary to build it have been
added to toolchain/cross-compiler.

target/rosetta.target

@@ -0,0 +1,42 @@
+[target]
+name = 'rosetta'
+base_components = [
+	'libmagenta',
+	'libc',
+	'libpthread',
+	'libc-headers',
+]
+default_prefix = '/usr'
+
+[dependency]
+seeds = [
+	'libfx-host',
+	'xpcg',
+	'magenta',
+	'libmagenta',
+	'librosetta',
+	'libc',
+	'libpthread',
+	'libc-core',
+	'libc-io',
+	'libc-runtime',
+	'libc-pthread',
+	'libc-exec',
+	'libc-malloc',
+
+	'librosetta-interface',
+	'ld',
+	'bootstrap',
+	'bshell',
+	'libfs',
+	'libxpc',
+	'libfx',
+	'base',
+	'herdd',
+	'herdd-targets',
+	'nsd',
+	'devmd',
+	'bsp'
+]
+
+# vim: ft=toml