znc: link to libstdc++ to fix performance issues on channel join

ZNC uses a map to cache channel memebers on join. Unfortunately uclibc++
uses a naive linked-list implementation with horrible performance, which
can cause joins to take a few minutes on popular channels.

Therefore Switch to libstdc++ which uses a much more performant hashmap.
ZNC by itself is already rather large, so the added footprint of
libstd++ vs uclibc++ does not matter that much anyway.

Should fix #11778.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

net/znc/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=znc
 PKG_VERSION:=1.4
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://znc.in/releases \
@@ -33,7 +33,7 @@ endef
 
 define Package/znc
   $(Package/znc/default)
-  DEPENDS:=+libopenssl +libpthread $(CXX_DEPENDS)
+  DEPENDS:=+libopenssl +libpthread +libstdcpp
   MENU:=1
 endef
 
@@ -261,14 +261,13 @@ $(eval $(call webskin,ice))
 
 PKG_CONFIG_DEPENDS := $(patsubst %,CONFIG_PACKAGE_%,$(ZNC_MODULES))
 
-include $(INCLUDE_DIR)/uclibc++.mk
 include $(INCLUDE_DIR)/package.mk
 
 CONFIGURE_VARS += \
-	CXXFLAGS="$(TARGET_CFLAGS) -fno-builtin -fno-rtti -nostdinc++" \
+	CXXFLAGS="$(TARGET_CFLAGS) -fno-builtin -fno-rtti" \
 	CPPFLAGS="-I$(STAGING_DIR)/usr/include -I$(STAGING_DIR)/include" \
 	LDFLAGS="-nodefaultlibs -lc -L$(STAGING_DIR)/usr/lib -L$(STAGING_DIR)/lib" \
-	LIBS="-luClibc++ -lm -lssl -lcrypto $(LIBGCC_S) -lc"
+	LIBS="-lstdc++ -lm -lssl -lcrypto $(LIBGCC_S) -lc"
 
 CONFIGURE_ARGS += \
 	--disable-c-ares \

net/znc/patches/002-Uclibcpp_build_fix.patch

@@ -1,28 +0,0 @@
-From fa14938321eda39f16bee6068296e6abc9df7b85 Mon Sep 17 00:00:00 2001
-From: Jonas Gorski <jonas.gorski+openwrt@gmail.com>
-Date: Wed, 6 Apr 2011 04:11:48 +0200
-Subject: [PATCH] Add a uClibc++ build workaround
-
----
- modules/webadmin.cpp |    4 +++-
- 1 files changed, 3 insertions(+), 1 deletions(-)
-
---- a/modules/webadmin.cpp
-+++ b/modules/webadmin.cpp
-@@ -20,6 +20,7 @@
- #include <znc/IRCNetwork.h>
- #include <znc/IRCSock.h>
- 
-+using std::string;
- using std::stringstream;
- using std::make_pair;
- using std::set;
-@@ -75,7 +76,7 @@ class CWebAdminMod : public CModule {
- public:
- 	MODCONSTRUCTOR(CWebAdminMod) {
- 		VPair vParams;
--		vParams.push_back(make_pair("user", ""));
-+		vParams.push_back(make_pair((string)"user", (string)""));
- 		AddSubPage(new CWebSubPage("settings", "Global Settings", CWebSubPage::F_ADMIN));
- 		AddSubPage(new CWebSubPage("edituser", "Your Settings", vParams));
- 		AddSubPage(new CWebSubPage("traffic", "Traffic Info", CWebSubPage::F_ADMIN));

net/znc/patches/900-remove_cpp11_usage.patch

@@ -1,13 +0,0 @@
-diff --git a/modules/certauth.cpp b/modules/certauth.cpp
-index 61e5687..4857d59 100644
---- a/modules/certauth.cpp
-+++ b/modules/certauth.cpp
-@@ -204,7 +204,7 @@ public:
- 			return;
- 		}
- 
--		SCString::const_iterator it2 = it->second.begin();
-+		SCString::iterator it2 = it->second.begin();
- 		while (id > 1) {
- 			++it2;
- 			id--;