Preopt APEX system server jars from prebuilts.

Similar to the previous CL, but for jars from prebuilts.

Test: manual - 1. Patch aosp/1818020 and aosp/1810840.
  2. m SOONG_CONFIG_art_module_source_build=false com.android.art
Bug: 194150908
Change-Id: Idc0c73a78045a602ad3a91cb5071d291bd611015
diff --git a/apex/deapexer.go b/apex/deapexer.go
index c70da15..2c1835a 100644
--- a/apex/deapexer.go
+++ b/apex/deapexer.go
@@ -97,7 +97,7 @@
 	// Create and remember the directory into which the .apex file's contents will be unpacked.
 	deapexerOutput := android.PathForModuleOut(ctx, "deapexer")
 
-	exports := make(map[string]android.Path)
+	exports := make(map[string]android.WritablePath)
 
 	// Create mappings from apex relative path to the extracted file's path.
 	exportedPaths := make(android.Paths, 0, len(exports))