Amend list of required Rust stdlib libraries.

Add libtest to our list of stdlib libraries, and remove some others that
are only used when generating proc_macros (which aren't dynamic).

Bug: 141207434
Test: m -j crosvm.experimental
Change-Id: I39cb030940adf1993e861d0142378eeea8b1ff5e
diff --git a/rust/config/global.go b/rust/config/global.go
index 7f9f993..903a424 100644
--- a/rust/config/global.go
+++ b/rust/config/global.go
@@ -26,15 +26,9 @@
 	RustDefaultBase    = "prebuilts/rust/"
 	DefaultEdition     = "2018"
 	Stdlibs            = []string{
-		"libarena",
-		"libfmt_macros",
-		"libgraphviz",
-		"libserialize",
 		"libstd",
-		"libsyntax",
-		"libsyntax_ext",
-		"libsyntax_pos",
 		"libterm",
+		"libtest",
 	}
 )