Rename ldd input file to ldd.sh to make Bazel conversion easier.

Test: m and bp2build write; bazel build ...
Change-Id: Ic8a4ad6ac81f034ac8b9736d99a322c48598619e
diff --git a/linker/Android.bp b/linker/Android.bp
index 06e6fbc..8b2d842 100644
--- a/linker/Android.bp
+++ b/linker/Android.bp
@@ -391,7 +391,7 @@
 
 sh_binary {
     name: "ldd",
-    src: "ldd",
+    src: "ldd.sh",
     bazel_module: { bp2build_available: true },
 }