c-ares: do not look properties for fallback dns

They're working on old versions of Android only.

Logcat:

  04-10 20:50:22.854 22854 22854 E libc    : Access denied finding property "net.dns1"

packages/c-ares/build.sh

@@ -2,6 +2,7 @@ TERMUX_PKG_HOMEPAGE=https://c-ares.haxx.se
 TERMUX_PKG_DESCRIPTION="Library for asynchronous DNS requests (including name resolves)"
 TERMUX_PKG_LICENSE="MIT"
 TERMUX_PKG_VERSION=1.16.0
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=https://github.com/c-ares/c-ares/archive/cares-${TERMUX_PKG_VERSION//./_}.tar.gz
 TERMUX_PKG_SHA256=b045ef78cda05edd4c677ab351f209315aab8fb041051031bdbe185aaf74baf3
 TERMUX_PKG_BREAKS="c-ares-dev"

packages/c-ares/hardcode-fallback-dns.patch

@@ -0,0 +1,26 @@
+diff -uNr c-ares-cares-1_16_0/ares_init.c c-ares-cares-1_16_0.mod/ares_init.c
+--- c-ares-cares-1_16_0/ares_init.c	2020-03-12 18:58:05.000000000 +0200
++++ c-ares-cares-1_16_0.mod/ares_init.c	2020-04-10 21:00:59.756808053 +0300
+@@ -1585,20 +1585,8 @@
+    * We'll only run this if we don't have any dns servers
+    * because this will get the same ones (if it works). */
+   if (status != ARES_EOF) {
+-    char propname[PROP_NAME_MAX];
+-    char propvalue[PROP_VALUE_MAX]="";
+-    for (i = 1; i <= MAX_DNS_PROPERTIES; i++) {
+-      snprintf(propname, sizeof(propname), "%s%u", DNS_PROP_NAME_PREFIX, i);
+-      if (__system_property_get(propname, propvalue) < 1) {
+-        status = ARES_EOF;
+-        break;
+-      }
+-
+-      status = config_nameserver(&servers, &nservers, propvalue);
+-      if (status != ARES_SUCCESS)
+-        break;
+-      status = ARES_EOF;
+-    }
++    config_nameserver(&servers, &nservers, "8.8.4.4");
++    status = ARES_EOF;
+   }
+ #  endif /* HAVE___SYSTEM_PROPERTY_GET */
+ #elif defined(CARES_USE_LIBRESOLV)