giac: missing dependencies and fixes

- makedepend on mpfr-devel: used for arbitrary precision floats,
   otherwise they are limited to double precision (53 bits ~ 13 digits)

 - makedepend on pari-devel: used for number theory functions

 - fix one line of test output to match a change in pari

 - fix a bug in invmod which resulted in a test fail (chk_xavier)

 - increase stacksize in musl which is needed for tests to pass

In addition to the two new makedepends, there is a small patch that
fixes one line of test output to match a change in pari.

With this commit, all 12 tests pass in glibc and in musl.

See #28989 for the original issue.

common/shlibs

@@ -3964,4 +3964,5 @@ libopenaptx.so.0 libopenaptx-0.2.0_1
 libsimavr.so.1 simavr-1.6_2
 libsimavrparts.so.1 simavr-1.6_2
 libsword-1.8.1.so libsword-1.8.1_6
+libpari-gmp.so.7 pari-2.13.0_1
 libtree-sitter.so.0 tree-sitter-0.19.0_1

srcpkgs/giac/patches/invmod.patch

@@ -0,0 +1,14 @@
+--- src/modpoly.cc.orig	2020-02-18 10:07:10.000000000 -0300
++++ src/modpoly.cc	2021-03-08 02:18:09.443740199 -0300
+@@ -92,7 +92,10 @@
+   gen invenv(const gen & g,environment * env){
+     if (g.type==_USER)
+       return g._USERptr->inv();
+-    return invmod(g,env->modulo);
++    if (env->moduloon)
++      return invmod(g,env->modulo);
++    else
++      return gen(1)/g;
+   }
+
+   /*

srcpkgs/giac/patches/pari_2_11.patch

@@ -0,0 +1,17 @@
+Change test output for PARI 2.11
+
+See https://trac.sagemath.org/ticket/25567
+and https://xcas.univ-grenoble-alpes.fr/forum/viewtopic.php?f=4&t=2102
+
+diff -ru a/check/TP11-sol.cas.out1 b/check/TP11-sol.cas.out1
+--- check/TP11-sol.cas.out1	2014-10-21 10:51:48.000000000 +0200
++++ check/TP11-sol.cas.out1	2018-08-07 17:04:12.528052773 +0200
+@@ -10,7 +10,7 @@
+ 1073741824000000000000000000061203284109000000000000000000000000008409,
+ 2^3*3*389*733*156904374622257604823879982847602392900751802349981470895277241,
+ "Done",
+-matrix[[2,7,1],[3,2,1],[389,2,1],[733,2,1],[156904374622257604823879982847602392900751802349981470895277241,2,matrix[[2,13,1],[3,3,1],[5,2,1],[7,2,1],[56467,2,1],[6553084925887974620811527,2,matrix[[2,5,1],[19,2,1],[71,2,1],[126823,2,1]]]]]],
++1,
+ 0,
+ [],
+ 1,

srcpkgs/giac/template

@@ -1,11 +1,11 @@
 # Template file for 'giac'
 pkgname=giac
 version=1.5.0.87
-revision=3
+revision=4
 wrksrc="giac-${version%.*}"
 build_style=gnu-configure
 makedepends="fltk-devel gmp-devel gsl-devel lapack-devel
- libjpeg-turbo-devel libpng-devel readline-devel"
+ libjpeg-turbo-devel libpng-devel readline-devel mpfr-devel pari-devel"
 depends="desktop-file-utils hicolor-icon-theme"
 short_desc="Free computer algebra system"
 maintainer="Orphaned <orphan@voidlinux.org>"
@@ -14,6 +14,9 @@ homepage="https://www-fourier.ujf-grenoble.fr/~parisse/giac.html"
 distfiles="https://www-fourier.ujf-grenoble.fr/~parisse/debian/dists/stable/main/source/giac_${version%.*}-${version##*.}.tar.gz"
 checksum=bbd6f0aafe373de3c9ed53d21878224e847359fdd9a7cdf9e9096e7c960f10b4
 
+# need more than 4*65536 stack, see try_parse() in gen.cc line 11812
+LDFLAGS="-Wl,-z,stack-size=2097152"
+
 post_install() {
 	# remove duplicates
 	rm -r ${DESTDIR}/usr/share/doc