Generate libdl.so per-architecture version script

Bug: http://b/24767418
Change-Id: I3d5775ba44d4c8e7fc5f2fbebae10e022100f1e2
diff --git a/libc/tools/genversion-scripts.py b/libc/tools/genversion-scripts.py
index 73faf2a..37fb5e9 100755
--- a/libc/tools/genversion-scripts.py
+++ b/libc/tools/genversion-scripts.py
@@ -12,8 +12,10 @@
 all_arches = ["arm", "arm64", "mips", "mips64", "x86", "x86_64"]
 bionic_libc_root = os.path.join(os.environ["ANDROID_BUILD_TOP"], "bionic/libc")
 bionic_libm_root = os.path.join(os.environ["ANDROID_BUILD_TOP"], "bionic/libm")
+bionic_libdl_root = os.path.join(os.environ["ANDROID_BUILD_TOP"], "bionic/libdl")
 libc_script = os.path.join(bionic_libc_root, "libc.map.txt")
 libm_script = os.path.join(bionic_libm_root, "libm.map.txt")
+libdl_script = os.path.join(bionic_libdl_root, "libdl.map.txt")
 
 # TODO (dimity): generate architecture-specific version scripts as part of build
 
@@ -30,7 +32,7 @@
 class VersionScriptGenerator(object):
 
   def run(self):
-    for script in [libc_script, libm_script]:
+    for script in [libc_script, libm_script, libdl_script]:
       basename = os.path.basename(script)
       dirname = os.path.dirname(script)
       for arch in all_arches: