Trac #22364: Upgrade to pynac-0.7.5

Pynac-0.7.5 has
- crucial improvements to Gosper algorithm (#22090)
- pynac.pc additions

https://github.com/pynac/pynac/releases/download/pynac-0.7.5/pynac-0.7.5
.tar.bz2

URL: https://trac.sagemath.org/22364
Reported by: rws
Ticket author(s): Ralf Stephan
Reviewer(s): Volker Braun

build/pkgs/pynac/checksums.ini

@@ -1,4 +1,4 @@
 tarball=pynac-VERSION.tar.bz2
-sha1=f375fbb59ec841dc1fee6b09cf9cc2d5e06ea757
-md5=92b4d7b8a152536ec476ecb8bf208261
-cksum=262865416
+sha1=915c0d0669a1a337eb06c0dbba4e4ea86e1f5c3d
+md5=a076c6ae174b1d39662f8e775f4ffcf2
+cksum=85783609

build/pkgs/pynac/package-version.txt

@@ -1 +1 @@
-0.7.4.p0
+0.7.5

build/pkgs/pynac/spkg-install

@@ -26,7 +26,7 @@ build_pynac()
 {
     cd ${PYNACDIR}
     PKG_CONFIG_PATH=${SAGE_LOCAL}/lib/pkgconfig; export PKG_CONFIG_PATH
-    ./configure --disable-static --prefix=${SAGE_LOCAL} --libdir="$SAGE_LOCAL/lib"
+    ./configure --disable-static --prefix=${SAGE_LOCAL} --with-giac=no --libdir="$SAGE_LOCAL/lib"
     $MAKE
     if [ $? -ne 0 ]; then
         echo "Error building pynac."

src/sage/functions/orthogonal_polys.py

@@ -1922,7 +1922,7 @@ def _eval_(self, n, a, b, x):
         from sage.functions.other import gamma
         s = sum(binomial(n,m) * gamma(a+b+n+m+1) / gamma(a+m+1) * ((x-1)/2)**m for m in range(n+1))
         r = gamma(a+n+1) / factorial(n) / gamma(n+a+b+1) * s
-        return r.to_gamma().gamma_normalize()
+        return r.to_gamma().gamma_normalize().normalize()
 
     def _evalf_(self, n, a, b, x, **kwds):
         """