softethervpn: Really fix iconv support

softethervpn overrides nls.mk by defining its iconv functions. This only
works if the libc has iconv. In addition, it does not allow external
libiconv usage. TARGET_LDFLAGS is also the wrong place to add -liconv.

Removed SSL3 patch. It was needed for OpenSSL 1.0.2 but not anymore.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

net/softethervpn/Makefile

@@ -12,7 +12,7 @@ PKG_NAME:=softethervpn
 PKG_VERSION:=4.28-9669
 PKG_VERREL:=beta
 PKG_VERDATE:=2018.09.11
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_SOURCE:=softether-src-v$(PKG_VERSION)-$(PKG_VERREL).tar.gz
 PKG_SOURCE_URL:=http://www.softether-download.com/files/softether/v$(PKG_VERSION)-$(PKG_VERREL)-$(PKG_VERDATE)-tree/Source_Code/
@@ -25,7 +25,7 @@ PKG_LICENSE:=GPL-2.0
 PKG_LICENSE_FILES:=COPYING
 
 PKG_BUILD_DEPENDS:=softethervpn/host
-HOST_BUILD_DEPENDS:=readline/host
+HOST_BUILD_DEPENDS:=readline/host libiconv/host
 
 HAMCORE_SE2:=$(STAGING_DIR_HOST)/share/softethervpn/hamcore.se2
 
@@ -63,9 +63,6 @@ TARGET_CFLAGS += \
 	$(if $(CONFIG_OPENSSL_WITH_SSL3),,-DSSL_OP_NO_SSLv3) \
 	$(if $(filter mips mipsel,$(ARCH)),-minterlink-mips16)
 
-TARGET_LDFLAGS += \
-	-liconv
-
 # Select 32 or 64 bit Makefile for target build depending on 64bit config symbol
 MAKE_FLAGS += \
 	-f src/makefiles/linux_$(if $(CONFIG_ARCH_64BIT),64,32)bit.mak