aria2: Add some build config options

======================== ========================================
features                  dependency
======================== ========================================
HTTPS                    OSX or GnuTLS or OpenSSL or Windows
SFTP                     libssh2
BitTorrent               None. Optional: libnettle+libgmp or
                         libgcrypt or OpenSSL
Metalink                 libxml2 or Expat.
Checksum                 None. Optional: OSX or libnettle or
                         libgcrypt or OpenSSL or Windows
gzip, deflate in HTTP    zlib
Async DNS                C-Ares
Firefox3/Chromium cookie libsqlite3
XML-RPC                  libxml2 or Expat.
JSON-RPC over WebSocket  libnettle or libgcrypt or OpenSSL
======================== ========================================

Add 'CONFIG_' to 'PKG_CONFIG_DEPENDS'.

Signed-off-by: Hsing-Wang Liao <kuoruan@gmail.com>

net/aria2/Config.in

@@ -9,21 +9,63 @@ config ARIA2_OPENSSL
 	bool "OpenSSL"
 
 config ARIA2_GNUTLS
-	bool "GNUTLS"
+	bool "GnuTLS"
 
 config ARIA2_NOSSL
 	bool "No SSL Support"
 
 endchoice
 
+choice
+	prompt "Crypto Library"
+	depends on !ARIA2_OPENSSL
+	default ARIA2_NOCRYPOTLIB
+
+config ARIA2_NETTLE
+	bool "Nettle"
+
+config ARIA2_LIBGCRYPT
+	bool "Libgcrypt"
+
+config ARIA2_NOCRYPTO
+	bool "No Crypto Library"
+
+endchoice
+
+choice
+	prompt "XML Library"
+	default ARIA2_NOXML
+
+config ARIA2_LIBXML2
+	bool "Libxml2"
+
+config ARIA2_EXPAT
+	bool "Expat"
+
+config ARIA2_NOXML
+	bool "No XML Library"
+
+endchoice
+
+config ARIA2_GMP
+	bool "GNU Multiple Precision Arithmetic Library"
+	depends on ARIA2_NETTLE
+	default n
+
 config ARIA2_BITTORRENT
 	bool "Enable Bittorrent Support"
-	depends on ARIA2_OPENSSL
+	depends on ARIA2_OPENSSL || ARIA2_LIBGCRYPT || \
+		(ARIA2_NETTLE && ARIA2_GMP)
+	default n
+
+config ARIA2_METALINK
+	bool "Enable Metalink Support"
+	depends on !ARIA2_NOXML
 	default n
 
 config ARIA2_SFTP
-        bool "Enable SFTP Support"
-        default n
+	bool "Enable SFTP Support"
+	default n
 
 config ARIA2_ASYNC_DNS
 	bool "Enable Async DNS Support"
@@ -33,21 +75,9 @@ config ARIA2_COOKIE
 	bool "Enable Firefox3/Chromium Cookie Support"
 	default n
 
-config ARIA2_METALINK
-	bool "Enable Metalink Support"
-	default n
-
-choice
-	prompt "XML Library"
-	default ARIA2_LIBXML2
-	depends on ARIA2_METALINK
-
-config ARIA2_LIBXML2
-        bool "LIBXML2"
-
-config ARIA2_EXPAT
-	bool "EXPAT"
-
-endchoice
+config ARIA2_WEBSOCKET
+	bool "Enable JSON-RPC over WebSocket Support"
+	depends on ARIA2_OPENSSL || ARIA2_LIBGCRYPT || ARIA2_NETTLE
+	default y
 
 endmenu