libcurl-gnutls: add package, replaces gnURL

The gnURL-fork of cURL is no longer maintained as cURL finally supports
probing and selecting the TLS implementation at run-time.

Hence just build a gnuTLS-backed variant of libcurl, use patchelf to
change the shared object name, call the result libcurl-gnutls and be
done. Other distributions have opted for similar solutions.

In future we could convert the curl package to provide build-variants
for each TLS implementation; however, this is out of the scope of the
needs of GNUnet which used to be only user of libgnurl.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

net/libcurl-gnutls/Makefile

@@ -0,0 +1,112 @@
+#
+# Copyright (C) 2007-2023 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=libcurl-gnutls
+
+PKG_SOURCE_NAME:=curl
+PKG_VERSION:=7.86.0
+PKG_RELEASE:=1
+PKG_SOURCE:=$(PKG_SOURCE_NAME)-$(PKG_VERSION).tar.xz
+PKG_SOURCE_URL:=https://github.com/curl/curl/releases/download/curl-$(subst .,_,$(PKG_VERSION))/ \
+	https://dl.uxnr.de/mirror/curl/ \
+	https://curl.askapache.com/download/ \
+	https://curl.se/download/
+PKG_HASH:=2d61116e5f485581f6d59865377df4463f2e788677ac43222b496d4e49fb627b
+
+PKG_MAINTAINER:=Daniel Golle <daniel@makrotopia.org>
+PKG_LICENSE:=MIT
+PKG_LICENSE_FILES:=COPYING
+PKG_CPE_ID:=cpe:/a:haxx:libcurl
+PKG_ABI_VERSION:=4
+
+PKG_FIXUP:=autoreconf
+PKG_INSTALL:=1
+PKG_BUILD_PARALLEL:=1
+PKG_BUILD_DIR=$(BUILD_DIR)/$(PKG_NAME)/$(PKG_SOURCE_NAME)-$(PKG_VERSION)
+
+# Make sure headers are present for packages using libcurl-gnutls
+PKG_BUILD_DEPENDS:=curl
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/libcurl-gnutls
+  SECTION:=libs
+  CATEGORY:=Libraries
+  URL:=https://gnunet.org/en/gnurl.html
+  SECTION:=libs
+  CATEGORY:=Libraries
+  DEPENDS:=+libgnutls +libidn2 +zlib
+  TITLE:=A client-side HTTP/HTTPS transfer library (build against gnuTLS)
+  ABI_VERSION:=$(PKG_ABI_VERSION)
+endef
+
+TARGET_CFLAGS += $(FPIC)
+
+CONFIGURE_ARGS += \
+	$(call autoconf_bool,CONFIG_IPV6,ipv6) \
+	--with-gnutls="$(STAGING_DIR)/usr" \
+	--with-libidn="$(STAGING_DIR)/usr" \
+	--with-zlib="$(STAGING_DIR)/usr" \
+	--with-ca-path="/etc/ssl/certs/" \
+	--enable-shared \
+	--enable-static \
+	--without-axtls \
+	--without-brotli \
+	--without-libssh2 \
+	--without-winidn \
+	--without-librtmp \
+	--without-nghttp2 \
+	--without-nss \
+	--without-cyassl \
+	--without-libpsl \
+	--without-polarssl \
+	--without-openssl \
+	--without-winssl \
+	--without-zstd \
+	--disable-ares \
+	--disable-sspi \
+	--disable-crypto-auth \
+	--disable-ntlm-wb \
+	--disable-tls-srp \
+	--disable-ldap \
+	--disable-ldaps \
+	--disable-mqtt \
+	--disable-rtsp \
+	--disable-dict \
+	--disable-telnet \
+	--disable-tftp \
+	--disable-pop3 \
+	--disable-imap \
+	--disable-smtp \
+	--disable-gopher \
+	--disable-file \
+	--disable-ftp \
+	--disable-smb \
+	--disable-debug \
+	--disable-manual \
+	--disable-verbose
+
+define Build/Compile
+	$(call Build/Compile/Default)
+	patchelf --set-soname 'libcurl-gnutls.so.$(PKG_ABI_VERSION)' $(PKG_BUILD_DIR)/lib/.libs/libcurl.so.$(PKG_ABI_VERSION).*
+endef
+
+define Build/InstallDev
+	$(INSTALL_DIR) $(1)/usr/lib
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libcurl.so.$(PKG_ABI_VERSION).* $(1)/usr/lib/libcurl-gnutls.so.$(PKG_ABI_VERSION)
+	$(LN) libcurl-gnutls.so.$(PKG_ABI_VERSION) $(1)/usr/lib/libcurl-gnutls.so
+endef
+
+define Package/libcurl-gnutls/install
+	$(INSTALL_DIR) $(1)/usr/lib
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libcurl.so.$(PKG_ABI_VERSION).* $(1)/usr/lib/libcurl-gnutls.so.$(PKG_ABI_VERSION)
+	$(LN) libcurl-gnutls.so.$(PKG_ABI_VERSION) $(1)/usr/lib/libcurl-gnutls.so
+endef
+
+$(eval $(call BuildPackage,libcurl-gnutls))