add patch for Pari bug #2441, cf trac 34900

see https://trac.sagemath.org/ticket/34900 and
https://pari.math.u-bordeaux.fr/cgi-bin/bugreport.cgi?bug=2441
for details

Author: dimpase

build/pkgs/pari/package-version.txt

@@ -1 +1 @@
-2.15.2
+2.15.2.p1

build/pkgs/pari/patches/bug2441.patch

@@ -0,0 +1,20 @@
+diff --git a/src/basemath/ellsea.c b/src/basemath/ellsea.c
+index a6871fa6a7..f1e725ea55 100644
+--- a/src/basemath/ellsea.c
++++ b/src/basemath/ellsea.c
+@@ -1303,6 +1303,7 @@ find_trace_Elkies_power(GEN a4, GEN a6, ulong ell, long *pt_k, struct meqn *MEQN
+   lambda = tr ? find_eigen_value_oneroot(a4, a6, ell, tr, kpoly, T, p):
+                 find_eigen_value_power(a4, a6, ell, 1, 1, kpoly, T, p);
+   if (DEBUGLEVEL>1) err_printf(" [%ld ms]", timer_delay(ti));
++  if (lambda==ell) return NULL;
+   if (smallfact && smallfact%(long)ell!=0)
+   {
+     ulong pell = pellk%ell;
+@@ -1317,6 +1318,7 @@ find_trace_Elkies_power(GEN a4, GEN a6, ulong ell, long *pt_k, struct meqn *MEQN
+     if (!tmp) { k = cnt-1; break; }
+     if (DEBUGLEVEL) err_printf(", %Ps", powuu(ell, cnt));
+     lambda = find_eigen_value_power(a4, a6, ell, cnt, lambda, gel(tmp,3), T, p);
++    if (lambda == upowuu(ell, cnt)) { k = cnt-1; break; }
+     Eba4 = Eca4;
+     Eba6 = Eca6;
+     Eca4 = gel(tmp,1);