Soong Rust source clean up.

Break up some of the longer lines in the Rust source and refactor the
TransformSrcto* functions to take fewer arguments.

Bug: N/A
Test: m -j crosvm.experimental
Change-Id: Ia0deb8bfe3e1bfd07ef35633e9a7e6f5e799b3a3

rust/binary.go

@@ -28,7 +28,8 @@ type BinaryCompilerProperties struct {
 	// path to the main source file that contains the program entry point (e.g. src/main.rs)
 	Srcs []string `android:"path,arch_variant"`
 
-	// passes -C prefer-dynamic to rustc, which tells it to dynamically link the stdlib (assuming it has no dylib dependencies already)
+	// passes -C prefer-dynamic to rustc, which tells it to dynamically link the stdlib
+	// (assuming it has no dylib dependencies already)
 	Prefer_dynamic *bool
 }
 
@@ -73,7 +74,8 @@ func (binary *binaryDecorator) compilerFlags(ctx ModuleContext, flags Flags) Fla
 	flags = binary.baseCompiler.compilerFlags(ctx, flags)
 
 	if ctx.toolchain().Bionic() {
-		// no-undefined-version breaks dylib compilation since __rust_*alloc* functions aren't defined, but we can apply this to binaries.
+		// no-undefined-version breaks dylib compilation since __rust_*alloc* functions aren't defined,
+		// but we can apply this to binaries.
 		flags.LinkFlags = append(flags.LinkFlags,
 			"-Wl,--gc-sections",
 			"-Wl,-z,nocopyreloc",