[build] first pass at multiarch support

Changing bonnibel to respect the --arch flag to configure. This requires
some reworking of modules, mostly in the addition of the ModuleList
class instead of just a dict of modules.

assets/build/amd64/target.init.yaml

@@ -0,0 +1,40 @@
+---
+ccflags: [
+  "--target=x86_64-jsix-elf",
+  "-fno-omit-frame-pointer",
+  "-fno-stack-protector",
+
+  "-fvisibility=hidden",
+  "-fvisibility-inlines-hidden",
+
+  "-D__ELF__",
+  "-D__jsix__",
+  "-U__linux",
+  "-U__linux__",
+
+  "-DMSPACES",
+
+  "--sysroot='${source_root}/sysroot'"
+]
+
+
+cxxflags: [
+  "-fno-exceptions",
+  "-fno-rtti",
+  "-isystem", "${source_root}/sysroot/include/c++/v1",
+]
+
+ldflags: [
+  "-Bstatic",
+  "-m", "elf_x86_64",
+  "--sysroot='${source_root}/sysroot'",
+  "--no-eh-frame-hdr",
+  "-L", "${source_root}/sysroot/lib",
+  "-z", "separate-code",
+  "-lc++", "-lc++abi", "-lunwind",
+  "--no-dependent-libraries",
+]
+
+libs: [
+  "${target_dir}/crt0.o",
+]