Use Stem where output file name is expected in APEX

Bug: 157638999
Test: m
Merged-In: I4a4892bc2941cf1301d210fc3107c02f0e7b13b7
(cherry picked from commit f1493cc0f24fcc7736623faf171ba404fb06fef8)
Change-Id: I4a4892bc2941cf1301d210fc3107c02f0e7b13b7
diff --git a/apex/builder.go b/apex/builder.go
index cebd86a..ee097e4 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -395,7 +395,7 @@
 		var readOnlyPaths = []string{"apex_manifest.json", "apex_manifest.pb"}
 		var executablePaths []string // this also includes dirs
 		for _, f := range a.filesInfo {
-			pathInApex := filepath.Join(f.installDir, f.builtFile.Base())
+			pathInApex := f.Path()
 			if f.installDir == "bin" || strings.HasPrefix(f.installDir, "bin/") {
 				executablePaths = append(executablePaths, pathInApex)
 				for _, s := range f.symlinks {
@@ -634,7 +634,7 @@
 			apexBundleName := a.Name()
 			for _, fi := range a.filesInfo {
 				dir := filepath.Join("apex", apexBundleName, fi.installDir)
-				target := ctx.InstallFile(android.PathForModuleInstall(ctx, dir), fi.builtFile.Base(), fi.builtFile)
+				target := ctx.InstallFile(android.PathForModuleInstall(ctx, dir), fi.Stem(), fi.builtFile)
 				for _, sym := range fi.symlinks {
 					ctx.InstallSymlink(android.PathForModuleInstall(ctx, dir), sym, target)
 				}