openvpn: add option for --enable-password-save

Added configuration option BR2_PACKAGE_OPENVPN_PWSAVE that
adds --enable-password-save to OPENVPN_CONF_OPTS if selected.

[Thomas: rewrap Config.in help text, as suggested by Vicente.]

Signed-off-by: Andreas Wetzel <andreas.wetzel@nanotronic.ch>
Reviewed-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/openvpn/Config.in

@@ -27,6 +27,12 @@ config BR2_PACKAGE_OPENVPN_SMALL
 	  You loose eurephia, debugging info, help messages and more.
 	  It saves around 100 KiB in binary file size.
 
+config BR2_PACKAGE_OPENVPN_PWSAVE
+	bool "Allow passwords in files"
+	help
+	  Allow --askpass and --auth-user-pass passwords to be read
+	  from a file.
+
 choice
 	prompt "Crypto backend"
 	default BR2_PACKAGE_OPENVPN_CRYPTO_OPENSSL

package/openvpn/openvpn.mk

@@ -41,6 +41,12 @@ else
 OPENVPN_CONF_OPTS += --disable-lzo
 endif
 
+ifeq ($(BR2_PACKAGE_OPENVPN_PWSAVE),y)
+OPENVPN_CONF_OPTS += --enable-password-save
+else
+OPENVPN_CONF_OPTS += --disable-password-save
+endif
+
 ifeq ($(BR2_PACKAGE_OPENVPN_CRYPTO_OPENSSL),y)
 OPENVPN_CONF_OPTS += --with-crypto-library=openssl
 OPENVPN_DEPENDENCIES += openssl