Add libcares to version 1.12, see CVE-2016-5180

Change-Id: I79f4f3328dcb825a73d9f61adc1385db645d7ad3
diff --git a/c-ares-1.12.0.tar.gz b/c-ares-1.12.0.tar.gz
new file mode 100644
index 0000000..fb0bb16
--- /dev/null
+++ b/c-ares-1.12.0.tar.gz
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