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/00_core

@@ -0,0 +1,8 @@
+[bootstrap]
+bootstrap_exec = '/boot/bootstrap'
+
+[contents]
+"/lib" = [ '/lib/ld64.so' ]
+"/usr/bin" = [ '/usr/bin/herdd' ]
+
+# vim: ft=toml

sys/bsp/rosetta.preset/01_baselibs

@@ -0,0 +1,16 @@
+[contents]
+"/usr/lib" = [
+	'/usr/lib/libc.so',
+	'/usr/lib/libpthread.so',
+	'/usr/lib/libfs.so',
+	'/usr/lib/libfx.runtime.so',
+	'/usr/lib/libfx.collections.so',
+	'/usr/lib/libfx.io.so',
+	'/usr/lib/libfx.serial.so',
+	'/usr/lib/libfx.term.so',
+	'/usr/lib/libfx.cmdline.so',
+	'/usr/lib/liblaunch.so',
+	'/usr/lib/libxpc.so',
+]
+
+# vim: ft=toml

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

sys/bsp/rosetta.preset/03_targets

@@ -0,0 +1,7 @@
+[contents]
+"/etc/herdd/targets" = [
+	'/etc/herdd/targets/minimal.target',
+	'/etc/herdd/targets/single-user.target',
+]
+
+# vim: ft=toml

sys/bsp/rosetta.preset/50_bshell

@@ -0,0 +1,8 @@
+[contents]
+"/usr/bin" = [ '/usr/bin/bshell' ]
+"/usr/lib" = [
+	'/usr/lib/libbshell.runtime.so',
+	'/usr/lib/libbshell.core.so',
+]
+
+# vim: ft=toml