Update mingw-w64-gcc to 13.2.1

* Import PKGBUILD from official repos
* Use Git and update to same commit as official `gcc` package

gcc/mingw-w64/PKGBUILD

@@ -0,0 +1,68 @@
+# Maintainer of official package: Felix Yan <felixonmars@archlinux.org>
+
+pkgname=mingw-w64-gcc
+pkgver=13.2.1
+pkgrel=1
+pkgdesc="Cross GCC for the MinGW-w64 cross-compiler"
+arch=('x86_64' 'aarch64')
+url="https://gcc.gnu.org"
+license=('GPL' 'LGPL' 'FDL' 'custom')
+groups=('mingw-w64-toolchain' 'mingw-w64')
+depends=('zlib' 'libisl' 'libmpc' 'mingw-w64-crt' 'mingw-w64-binutils' 'mingw-w64-winpthreads' 'mingw-w64-headers')
+# gcc-d doesn't build as of 13.1.0
+makedepends=("gcc-ada" "git")
+options=('!strip' 'staticlibs' '!emptydirs' '!buildflags')
+_commit=d8a0dcd146dd95e2b6b85cf82c445214d364cf3b
+source=(git+https://sourceware.org/git/gcc.git#commit=${_commit})
+#source=(https://ftp.gnu.org/gnu/gcc/gcc-$pkgver/gcc-$pkgver.tar.xz{,.sig})
+validpgpkeys=(F3691687D867B81B51CE07D9BBE43771487328A9  # bpiotrowski@archlinux.org
+              86CFFCA918CF3AF47147588051E8B148A9999C34  # evangelos@foutrelis.com
+              13975A70E63C361C73AE69EF6EEB81F8981C74C7  # richard.guenther@gmail.com
+              D3A93CAD751C2AF4F8C7AD516C35B99309B5FA62) # Jakub Jelinek <jakub@redhat.com>
+sha512sums=('SKIP')
+
+_architectures="i686-w64-mingw32 x86_64-w64-mingw32"
+
+prepare() {
+  ln -sf gcc-${pkgver/+/-} gcc
+  cd gcc
+
+  # mmapio.c:69:14: error: implicit declaration of function ‘getpagesize’
+  sed -i 's|\-Werror||g' libbacktrace/configure
+}
+
+build() {
+  for _arch in ${_architectures}; do
+    mkdir -p "$srcdir"/build-${_arch} && cd "$srcdir"/build-${_arch}
+    "$srcdir"/gcc/configure --prefix=/usr --libexecdir=/usr/lib \
+        --target=${_arch} \
+        --with-bugurl=https://bugs.archlinux.org/ \
+        --enable-languages=ada,c,c++,fortran,lto,objc,obj-c++ \
+        --enable-shared --enable-static \
+        --enable-threads=posix --enable-fully-dynamic-string \
+        --enable-libstdcxx-time=yes --enable-libstdcxx-filesystem-ts=yes \
+        --with-system-zlib --enable-cloog-backend=isl \
+        --enable-lto --enable-libgomp \
+        --disable-multilib --enable-checking=release \
+        --disable-sjlj-exceptions --with-dwarf2
+    make
+  done
+}
+
+package() {
+  for _arch in ${_architectures}; do
+    cd "$srcdir"/build-${_arch}
+    make DESTDIR="$pkgdir" install
+    ${_arch}-strip "$pkgdir"/usr/${_arch}/lib/*.dll
+    strip "$pkgdir"/usr/bin/${_arch}-*
+    strip "$pkgdir"/usr/lib/gcc/${_arch}/${pkgver}/{cc1*,collect2,gnat1,f951,lto*}
+    ln -s ${_arch}-gcc "$pkgdir"/usr/bin/${_arch}-cc
+    # mv dlls
+    mkdir -p "$pkgdir"/usr/${_arch}/bin/
+    mv "$pkgdir"/usr/${_arch}/lib/*.dll "$pkgdir"/usr/${_arch}/bin/
+  done
+  strip "$pkgdir"/usr/bin/*
+  # remove unnecessary files
+  rm -r "$pkgdir"/usr/share
+  rm "$pkgdir"/usr/lib/libcc1.*
+}