Set CURL_CA_FALLBACK so boringssl looks in default cert location

We have a default certificate location configured inside boringssl that
points to our root certificates, but boringssl only looks there if you
call SSL_CTX_set_verify_paths() on the ssl context. This configures
curl to make this call so SSL connections can terminate successfully.

Change-Id: I432d174cefc29276c71ac8cf818cb42a9825c252
diff --git a/lib/curl_config.h.fuchsia b/lib/curl_config.h.fuchsia
index 73d7a88..47b27eb 100644
--- a/lib/curl_config.h.fuchsia
+++ b/lib/curl_config.h.fuchsia
@@ -5,7 +5,7 @@
 /* #undef CURL_CA_BUNDLE */
 
 /* define "1" to use built in CA store of SSL library */
-/* #undef CURL_CA_FALLBACK */
+#define CURL_CA_FALLBACK 1
 
 /* Location of default ca path */
 /* #undef CURL_CA_PATH */