Trac #23922: Upgrade eclib to compile with xcode 9

'''Tarball''': http://homepages.warwick.ac.uk/staff/J.E.Cremona/ftp/ecli
b-20171002.tar.bz2

URL: https://trac.sagemath.org/23922
Reported by: fbissey
Ticket author(s): François Bissey, Isuru Fernando, Jeroen Demeyer
Reviewer(s): John Cremona, John Palmieri, Dima Pasechnik

build/pkgs/eclib/SPKG.txt

@@ -2,9 +2,16 @@
 
 == Description ==
 
-John Cremona's programs for enumerating and computing with elliptic
-curves defined over the rational numbers. This is the culmination of
-over 25 years of hard work.
+mwrank is a program written in C++ for computing Mordell-Weil groups of
+elliptic curves over Q via 2-descent. It is available as source code in
+the eclib package, which may be distributed under the GNU General Public
+License, version 2, or any later version.
+
+mwrank is now only distributed as part of eclib. eclib is also included
+in Sage, and for most potential users the easiest way to run mwrank is
+to install Sage (which also of course gives you much much more). I no
+longer provide a source code distribution of mwrank by itself: use eclib
+instead.
 
 == License ==
 
@@ -14,13 +21,11 @@ eclib is licensed GPL v2+.
 
  * Author: John Cremona
  * Email: john.cremona@gmail.com
- * Website: https://github.com/JohnCremona/eclib
+ * Website: http://homepages.warwick.ac.uk/staff/J.E.Cremona/mwrank/index.html
+ * Repository: https://github.com/JohnCremona/eclib
 
 == Dependencies ==
 
  * PARI
  * NTL
  * FLINT
-
-
-

build/pkgs/eclib/checksums.ini

@@ -1,4 +1,4 @@
 tarball=eclib-VERSION.tar.bz2
-sha1=2527c49624bb90619b4b185c38dc6c3bc9737b38
-md5=2c0557cecb1145b7df6ddc71332b0656
-cksum=1113684095
+sha1=abd277f71416966f36eb8e1b0a814d7028c56baa
+md5=2c6e90c61f49cf9c38a5c9fd9a1ebcef
+cksum=1683788031

build/pkgs/eclib/package-version.txt

@@ -1 +1 @@
-20170330
+20171002