ios: optimize gmp and nettle

This greatly improve ringID generation from 2m30s-2m50s to 40s-50s
(tested on iPhone 5S)

Change-Id: I8a469d68a5a1869bd2daa800dd2d2d5eed949466
Tuleap: #313

contrib/src/gmp/rules.mak

@@ -14,7 +14,7 @@ gmp: gmp-$(GMP_VERSION).tar.bz2 .sum-gmp
 
 .gmp: gmp
 ifdef HAVE_IOS
-	cd $< && $(HOSTVARS) ./configure --disable-assembly $(HOSTCONF)
+	cd $< && $(HOSTVARS) CFLAGS="$(CFLAGS) -O3" ./configure --disable-assembly $(HOSTCONF)
 else
 	cd $< && $(HOSTVARS) ./configure $(HOSTCONF)
 endif

contrib/src/nettle/rules.mak

@@ -22,6 +22,12 @@ nettle: nettle-$(NETTLE_VERSION).tar.gz .sum-nettle
 DEPS_nettle = gmp $(DEPS_gmp)
 
 .nettle: nettle
+ifdef HAVE_IOS
+	cd $< && sed -i.orig s/-ggdb3//g configure.ac
+	cd $< && autoreconf
+	cd $< && $(HOSTVARS) CFLAGS="$(CFLAGS) -O3" ./configure $(HOSTCONF)
+else
 	cd $< && $(HOSTVARS) ./configure $(HOSTCONF)
+endif
 	cd $< && $(MAKE) install
 	touch $@