Add android_get_device_api_level.

Bug: http://b/113615412
Test: ran tests
Change-Id: I0a7ae336c96c9ed6543b6935cbc242d14d4a4a67
diff --git a/libc/Android.bp b/libc/Android.bp
index fe65ace..d7ad117 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -1298,6 +1298,7 @@
         "bionic/getpid.cpp",
         "bionic/getpriority.cpp",
         "bionic/gettid.cpp",
+        "bionic/get_device_api_level.cpp",
         "bionic/grp_pwd.cpp",
         "bionic/grp_pwd_file.cpp",
         "bionic/iconv.cpp",