[build] Add build knowledge of dynamic libraries

Bonnibel will now build dynamic libraries when they're dependencies for
non-statically linked modules. It will also copy those shared libraries
into the initrd image for programs being copied into the image.

src/user/ld.so/ld.so.module

@@ -1,8 +1,9 @@
 # vim: ft=python
 
 ldso = module("ld.so",
-    kind = "shared",
-    output = "ld.so",
+    kind = "lib",
+    static = True,
+    basename = "ld",
     targets = [ "user" ],
     deps = [ "libc", "util", "elf" ],
     description = "Dynamic Linker",
@@ -12,4 +13,4 @@ ldso = module("ld.so",
         "start.s",
     ])
 
-ldso.variables["ldflags"] = ["${ldflags}", "--entry=_ldso_start"]
+ldso.variables["ldflags"] = ["${ldflags}", "--entry=_ldso_start"]

src/user/srv.init/init.module

@@ -3,6 +3,7 @@
 init = module("srv.init",
     targets = [ "init" ],
     deps = [ "libc", "elf", "bootproto", "zstd" ],
+    static = True,
     description = "Init server",
     ld_script = "init.ld",
     sources = [