clamav: Remove build hacks

Simplified the Makefile and fixes compilation with uClibc-ng. Also added
IPv6 support.

Took the time to clean up the Makefile with other useful options.

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

net/clamav/Makefile

@@ -9,17 +9,18 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=clamav
 PKG_VERSION:=0.101.2
-PKG_RELEASE:=1
-
-PKG_LICENSE:=GPL-2.0
-PKG_MAINTAINER:=Marko Ratkaj <marko.ratkaj@sartura.hr> \
-		Lucian Cristian <lucian.cristian@gmail.com>
-PKG_CPE_ID:=cpe:/a:clamav:clamav
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://www.clamav.net/downloads/production/
 PKG_HASH:=0a12ebdf6ff7a74c0bde2bdc2b55cae33449e6dd953ec90824a9e01291277634
 
+PKG_MAINTAINER:=Marko Ratkaj <marko.ratkaj@sartura.hr> \
+		Lucian Cristian <lucian.cristian@gmail.com>
+PKG_LICENSE:=GPL-2.0
+PKG_LICENSE_FILES:=COPYING*
+PKG_CPE_ID:=cpe:/a:clamav:clamav
+
 PKG_BUILD_PARALLEL:=1
 PKG_INSTALL:=1
 
@@ -57,34 +58,36 @@ endef
 define Package/clamav/conffiles
 endef
 
+CONFIGURE_ARGS += \
+	--sysconfdir=/etc/clamav/ \
+	--enable-milter \
+	--disable-bzip2 \
+	--disable-check \
+	--disable-clamdtop \
+	--disable-rpath \
+	--disable-xml \
+	--disable-zlib-vcheck \
+	--with-user=nobody \
+	--with-group=nogroup \
+	--with-libcurl="$(STAGING_DIR)/usr/" \
+	--with-libjson="$(STAGING_DIR)/usr/" \
+	--with-openssl="$(STAGING_DIR)/usr/" \
+	--with-pcre="$(STAGING_DIR)/usr/" \
+	--with-zlib="$(STAGING_DIR)/usr/" \
+	--without-xml \
+	--without-iconv \
+	--without-libncurses-prefix
+
 CONFIGURE_VARS += \
-	INCLUDES="" \
-	CXXFLAGS="$$$$CXXFLAGS -fno-rtti" \
-	$(if $(CONFIG_USE_MUSL),LIBS="-lpthread -lfts",LIBS="-lpthread") \
-
-define Build/Configure
-	$(call Build/Configure/Default, \
-		--sysconfdir=/etc/clamav/ \
-		--prefix=/usr/ \
-		--exec-prefix=/usr/ \
-		--enable-milter \
-		--with-xml=no \
-		--disable-bzip2 \
-		--with-user nobody \
-		--with-group nogroup \
-		--with-pcre="$(STAGING_DIR)/usr/" \
-		--with-openssl="$(STAGING_DIR)/usr/" \
-		--with-zlib="$(STAGING_DIR)/usr/" \
-		--disable-zlib-vcheck \
-		--disable-clamdtop \
-	)
-endef
+	ax_cv_uname_syscall=yes \
+	ac_cv_c_mmap_private=yes \
+	have_cv_gai=yes \
+	ac_cv_sys_file_offset_bits=no
 
-define Build/Compile
-	$(MAKE) -C $(PKG_BUILD_DIR) \
-		DESTDIR="$(PKG_INSTALL_DIR)" \
-		all install
-endef
+CONFIGURE_VARS += $(if $(CONFIG_IPV6),have_cv_ipv6=yes)
+
+TARGET_CXXFLAGS += -ffunction-sections -fdata-sections -fno-rtti -flto
+TARGET_LDFLAGS += -Wl,--gc-sections,--as-needed $(if $(CONFIG_USE_MUSL),-lfts)
 
 define Package/clamav/install
 	$(INSTALL_DIR) $(1)/usr/sbin