Move mtctxres.c to libc_dns.a.

Has the effect of making ___mtctxres hidden.

Bug: 11156955
Change-Id: I5aa5f49344ad5ecb33f48737430561b329bcbb0d
(cherry picked from commit 891ec7a6e46e60d7dfa1cf229e14a8e8634e272b)
diff --git a/libc/Android.mk b/libc/Android.mk
index 2007965..727513c 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -278,7 +278,6 @@
     upstream-netbsd/lib/libc/regex/regerror.c \
     upstream-netbsd/lib/libc/regex/regexec.c \
     upstream-netbsd/lib/libc/regex/regfree.c \
-    upstream-netbsd/lib/libc/resolv/mtctxres.c \
     upstream-netbsd/lib/libc/stdlib/bsearch.c \
     upstream-netbsd/lib/libc/stdlib/div.c \
     upstream-netbsd/lib/libc/stdlib/drand48.c \
@@ -634,6 +633,7 @@
     $(call all-c-files-under,dns) \
     upstream-netbsd/lib/libc/isc/ev_streams.c \
     upstream-netbsd/lib/libc/isc/ev_timers.c \
+    upstream-netbsd/lib/libc/resolv/mtctxres.c \
 
 LOCAL_CFLAGS := \
     $(libc_common_cflags) \