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_headers.go b/cc/ndk_headers.go
index 5fa3232..140cc2f 100644
--- a/cc/ndk_headers.go
+++ b/cc/ndk_headers.go
@@ -122,7 +122,7 @@
 	srcFiles := ctx.ExpandSources(m.properties.Srcs, nil)
 	for _, header := range srcFiles {
 		installDir := getHeaderInstallDir(ctx, header, m.properties.From, m.properties.To)
-		installedPath := ctx.InstallFile(installDir, header)
+		installedPath := ctx.InstallFile(installDir, header.Base(), header)
 		installPath := installDir.Join(ctx, header.Base())
 		if installPath != installedPath {
 			panic(fmt.Sprintf(