Make binaries executable

Split InstallFileName into InstallExecutable that does chmod +x
after copying the file.  Also remove InstallFile and rename
InstallFileName to InstallFile.

Test: m -j checkbuild
Change-Id: Id41ad4eafe521f6cd5d8cc250b7747ecb3da8dfc
diff --git a/cc/ndk_library.go b/cc/ndk_library.go
index fc7cd91..a408fc5 100644
--- a/cc/ndk_library.go
+++ b/cc/ndk_library.go
@@ -341,7 +341,7 @@
 
 	installDir := getNdkInstallBase(ctx).Join(ctx, fmt.Sprintf(
 		"platforms/android-%s/arch-%s/usr/%s", apiLevel, arch, libDir))
-	stub.installPath = ctx.InstallFile(installDir, path).String()
+	stub.installPath = ctx.InstallFile(installDir, path.Base(), path).String()
 }
 
 func newStubLibrary() *Module {