[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.

assets/build/rules.ninja

@@ -1,5 +1,3 @@
-# This file is automatically generated by bonnibel
-
 rule compile.c
   command = $cc -MMD -MF $out.d $cflags $ccflags -o $out -c $in
   description = Compiling [$target]:$name
@@ -42,15 +40,19 @@ rule parse.cog
 
 rule exe
   command = $ld $ldflags -o $out $in $libs
-  description = Linking $name
-
-rule lib
-  command = $ar qcs $out $in
-  description = Archiving [$target]:$name
+  description = Linking exe [$target]:$name
 
 rule driver
-  command = $ld $ldflags -shared -o $out $in $libs
-  description = Linking $name
+  command = $ld $ldflags -o $out $in $libs
+  description = Linking driver [$target]:$name
+
+rule lib
+  command = $ld -shared $ldflags -o $out $in $libs
+  description = Linking [$target]:$name
+
+rule lib_static
+  command = $ar qcs $out $in
+  description = Archiving [$target]:$name
 
 rule cp
   command = cp $in $out