Update networking layer w/ CURL and emscripten impl

External/curl-8.17.0/tests/data/test861

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+<testcase>
+<info>
+<keywords>
+POP3
+Clear Text
+UIDL
+CUSTOMREQUEST
+RFC2449
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<servercmd>
+CAPA UIDL USER
+</servercmd>
+# When doing UIDL, we get the default list output hard-coded in the test
+# POP3 server
+<datacheck crlf="yes">
+1 1
+2 2
+3 4
+</datacheck>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+pop3
+</server>
+<name>
+POP3 UIDL (CUSTOMREQUEST)
+</name>
+<command>
+pop3://%HOSTIP:%POP3PORT -u user:secret -X UIDL
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<protocol crlf="yes">
+CAPA
+USER user
+PASS secret
+UIDL
+QUIT
+</protocol>
+</verify>
+</testcase>