iOS: enable nat-pmp

This patch enables nat-pmp for iOS and macOS and
fixes build for iOS by removing USE_SYSCTL_NET_ROUTE,
which requires net/route.h that is not available
on iOS.

Change-Id: I7342f65a85ecbc0d7f291c981cc78ded2e741e58

contrib/src/dhtnet/rules.mak

@@ -6,12 +6,8 @@ PKGS += dhtnet
 DEPS_dhtnet += opendht pjproject asio upnp
 
 ifndef HAVE_WIN32
-ifndef HAVE_IOS
-ifndef HAVE_MACOSX
 DEPS_dhtnet += natpmp
 endif
-endif
-endif
 
 
 DHTNET_CONF = -DBUILD_SHARED_LIBS=Off \

contrib/src/natpmp/disable_sysctl_on_ios.patch

@@ -0,0 +1,21 @@
+diff --git a/getgateway.c b/getgateway.c
+index d05bc5e..33b8c45 100644
+--- a/getgateway.c
++++ b/getgateway.c
+@@ -56,10 +56,16 @@ POSSIBILITY OF SUCH DAMAGE.
+ #endif
+ 
+ #ifdef __APPLE__
++#include <TargetConditionals.h>
+ #undef USE_PROC_NET_ROUTE
+ #undef USE_SOCKET_ROUTE
++#if defined(TARGET_OS_IPHONE) || defined(TARGET_IPHONE_SIMULATOR)
++// iOS or Simulator: Do not use SYSCTL_NET_ROUTE
++#undef USE_SYSCTL_NET_ROUTE
++#else
+ #define USE_SYSCTL_NET_ROUTE
+ #endif
++#endif
+ 
+ #if (defined(sun) && defined(__SVR4))
+ #undef USE_PROC_NET_ROUTE

contrib/src/natpmp/rules.mak

@@ -3,10 +3,8 @@ NATPMP_VERSION := 007c3a53165a0551c877130eea4d966885ce19ae
 NATPMP_URL := https://github.com/miniupnp/libnatpmp/archive/${NATPMP_VERSION}.tar.gz
 
 ifndef HAVE_WIN32
-ifndef HAVE_IOS
 PKGS += natpmp
 endif
-endif
 
 ifeq ($(call need_pkg,'libnatpmp'),)
 PKGS_FOUND += natpmp
@@ -19,6 +17,9 @@ $(TARBALLS)/libnatpmp-$(NATPMP_VERSION).tar.gz:
 
 natpmp: libnatpmp-$(NATPMP_VERSION).tar.gz .sum-natpmp
 	$(UNPACK)
+ifdef HAVE_IOS
+	$(APPLY) $(SRC)/natpmp/disable_sysctl_on_ios.patch
+endif
 	$(MOVE)
 
 .natpmp: natpmp toolchain.cmake