gmp: fix build with gcc15 (#5507)

Fixes #5499

gmp/0001-gcc15.patch

@@ -0,0 +1,13 @@
+diff -r e84c5c785bbe -r 8e7bb4ae7a18 acinclude.m4
+--- a/acinclude.m4	Wed Dec 04 18:26:27 2024 +0100
++++ b/acinclude.m4	Wed Jan 29 22:38:02 2025 +0100
+@@ -609,7 +609,7 @@
+ 
+ #if defined (__GNUC__) && ! defined (__cplusplus)
+ typedef unsigned long long t1;typedef t1*t2;
+-void g(){}
++void g(int,t1 const*,t1,t2,t1 const*,int){}
+ void h(){}
+ static __inline__ t1 e(t2 rp,t2 up,int n,t1 v0)
+ {t1 c,x,r;int i;if(v0){c=1;for(i=1;i<n;i++){x=up[i];r=x+1;rp[i]=r;}}return c;}
+

gmp/PKGBUILD

@@ -3,7 +3,7 @@
 pkgbase=gmp
 pkgname=('gmp' 'gmp-devel')
 pkgver=6.3.0
-pkgrel=1
+pkgrel=2
 pkgdesc="A free library for arbitrary precision arithmetic"
 groups=('libraries')
 arch=('i686' 'x86_64')
@@ -13,15 +13,20 @@ msys2_references=(
 )
 license=('LGPL3')
 makedepends=('autotools' 'gcc')
-source=(https://ftp.gnu.org/gnu/gmp/gmp-${pkgver}.tar.xz{,.sig})
+source=(https://ftp.gnu.org/gnu/gmp/gmp-${pkgver}.tar.xz{,.sig}
+        "0001-gcc15.patch")
 sha256sums=('a3c2b80201b89e68616f4ad30bc66aee4927c3ce50e33929ca819d5c43538898'
-            'SKIP')
+            'SKIP'
+            '7c4e2eaaf4da1bd69904077a351d585ff022b1d2e742ec25f15886f0063a2cfe')
 validpgpkeys=('5972C48224C1E7E62AA0275D1150EE33C1A000B0'   # Marco Bodrato
               '343C2FF0FBEE5EC2EDBEF399F3599FF828C67298')   # Niels Möller
 
 prepare() {
   cd "${srcdir}/${pkgname}-${pkgver}"
 
+  # https://gmplib.org/repo/gmp/rev/8e7bb4ae7a18
+  patch -p1 < "${srcdir}/0001-gcc15.patch"
+
   autoreconf -fi
 }