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.

sys/bsp/rosetta.preset/02_services

@@ -0,0 +1,12 @@
+[contents]
+"/usr/bin" = [
+	'/usr/bin/devmd',
+	'/usr/bin/nsd',
+]
+
+"/etc/herdd/services" = [
+	'/etc/herdd/services/devmd.service',
+	'/etc/herdd/services/nsd.service',
+]
+
+# vim: ft=toml