xfer: fix DCC file receive on Termux (closes #1811)

This fixes such error displayed on Termux when receiving a DCC file:

xfer: invalid address "96747949": error 8 hostname nor servname provided, or not known

doc/en/weechat_dev.en.adoc

@@ -455,6 +455,7 @@ WeeChat "core" is located in following directories:
 |             test-relay-auth.cpp     | Tests: clients authentication.
 |          xfer/                      | Root of unit tests for Xfer plugin.
 |             test-xfer-file.cpp      | Tests: file functions.
+|             test-xfer-network.cpp   | Tests: network functions.
 |===
 
 [[documentation_translations]]

doc/fr/weechat_dev.fr.adoc

@@ -457,6 +457,7 @@ Le cœur de WeeChat est situé dans les répertoires suivants :
 |             test-relay-auth.cpp     | Tests : authentification des clients.
 |          xfer/                      | Racine des tests unitaires pour l'extension Xfer.
 |             test-xfer-file.cpp      | Tests : fonctions sur les fichiers.
+|             test-xfer-network.cpp   | Tests : fonctions réseau.
 |===
 
 [[documentation_translations]]

doc/ja/weechat_dev.ja.adoc

@@ -510,6 +510,8 @@ WeeChat "core" は以下のディレクトリに配置されています:
 |          xfer/                      | Root of unit tests for Xfer plugin.
 // TRANSLATION MISSING
 |             test-xfer-file.cpp      | Tests: file functions.
+// TRANSLATION MISSING
+|             test-xfer-network.cpp   | Tests: network functions.
 |===
 
 [[documentation_translations]]

doc/sr/weechat_dev.sr.adoc

@@ -459,6 +459,8 @@ WeeChat „језгро” се налази у следећим директо
 |          xfer/                      | Root of unit tests for Xfer plugin.
 // TRANSLATION MISSING
 |             test-xfer-file.cpp      | Tests: file functions.
+// TRANSLATION MISSING
+|             test-xfer-network.cpp   | Tests: network functions.
 |===
 
 [[documentation_translations]]