libzmq: Remove uClibc++ support

libzmq is used by fbzmq, which absolutely requires libstdcpp since it's a
C++14 project. There's no point in using two libc++.

Cleaned up Makefile for consistency between packages.

Added nanosleep patch for platforms that are missing usleep.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
(cherry-picked from ad11587c40)

libs/zmq/Makefile

@@ -1,4 +1,4 @@
-# 
+#
 # Copyright (C) 2016 OpenWrt.org
 #
 # This is free software, licensed under the GNU General Public License v2.
@@ -11,25 +11,22 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=zeromq
 PKG_VERSION:=4.1.7
-PKG_RELEASE:=1
-PKG_MAINTAINER:=Dirk Chang <dirk@kooiot.com>
-PKG_LICENSE:=GPL-3.0+
-PKG_LICENSE_FILES:=LICENCE.txt
-
-PKG_CPE_ID:=cpe:/a:zeromq:libzmq
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/zeromq/zeromq4-1/releases/download/v$(PKG_VERSION)
 PKG_HASH:=31c383cfcd3be1dc8a66e448c403029e793687e70473b89c4cc0bd626e7da299
-
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(BUILD_VARIANT)/$(PKG_NAME)-$(PKG_VERSION)
 
-PKG_FIXUP:=autoreconf
+PKG_MAINTAINER:=Dirk Chang <dirk@kooiot.com>
+PKG_LICENSE:=GPL-3.0-or-later
+PKG_LICENSE_FILES:=LICENCE.txt
+PKG_CPE_ID:=cpe:/a:zeromq:libzmq
 
 PKG_INSTALL:=1
+PKG_BUILD_PARALLEL:=1
+PKG_REMOVE_FILES:=autogen.sh acinclude.m4 aclocal.m4
 
-
-include $(INCLUDE_DIR)/uclibc++.mk
 include $(INCLUDE_DIR)/package.mk
 
 define Package/libzmq/default
@@ -37,7 +34,7 @@ define Package/libzmq/default
   URL:=http://www.zeromq.org/
   SECTION:=libs
   CATEGORY:=Libraries
-  DEPENDS:=+libuuid +libpthread +librt $(CXX_DEPENDS)
+  DEPENDS:=+libuuid +libpthread +librt +libstdcpp
   PROVIDES:=libzmq
 endef
 
@@ -65,7 +62,10 @@ endef
 # add extra configure flags here
 CONFIGURE_ARGS += \
 	--enable-static \
-	--enable-shared
+	--enable-shared \
+	--with-pic \
+	--with-relaxed \
+	--without-documentation
 
 ifeq ($(BUILD_VARIANT),curve)
   CONFIGURE_ARGS+= --with-libsodium
@@ -73,6 +73,8 @@ else
   CONFIGURE_ARGS+= --without-libsodium
 endif
 
+TARGET_CXXFLAGS += -Wno-error=cpp
+
 define Build/InstallDev
 	$(INSTALL_DIR) $(1)/usr/include
 	$(CP) $(PKG_INSTALL_DIR)/usr/include/zmq.h $(1)/usr/include