Remove perl-Sys-CPU

After https://github.com/msys2/MINGW-packages/pull/16025 there are no
more users of this package.

perl-Sys-CPU/0001-Cygwin-is-as-per-Windows.patch

@@ -1,12 +0,0 @@
-diff -urN Sys-CPU-0.61.orig/CPU.xs Sys-CPU-0.61/CPU.xs
---- Sys-CPU-0.61.orig/CPU.xs	2015-01-19 21:41:05.230451600 +0000
-+++ Sys-CPU-0.61/CPU.xs	2015-01-19 21:41:08.702650200 +0000
-@@ -11,7 +11,7 @@
- **************************************************************************************/
- 
- #define MAX_IDENT_SIZE 256
--#if defined(_WIN32) || defined(WIN32)
-+#if defined(_WIN32) || defined(WIN32) || defined(__CYGWIN__)
-   #define _have_cpu_type
-   #define _have_cpu_clock
-   #define WINDOWS

perl-Sys-CPU/PKGBUILD

@@ -1,34 +0,0 @@
-# Maintainer: Ray Donnelly <mingw.android@gmail.com>
-
-_realname=Sys-CPU
-pkgname=perl-${_realname}
-pkgver=0.61
-pkgrel=10
-pkgdesc="Provide commonly requested regular expressions"
-arch=('i686' 'x86_64')
-url="https://metacpan.org/author/MZSANFORD${_realname}-${pkgver}"
-groups=('perl-modules')
-depends=('perl')
-makedepends=('perl-devel' 'make' 'gcc')
-license=('GPL' 'PerlArtistic')
-source=("https://cpan.metacpan.org/authors/id/M/MZ/MZSANFORD/${_realname}-${pkgver}.tar.gz"
-        "0001-Cygwin-is-as-per-Windows.patch")
-sha256sums=('250a86b79c231001c4ae71d2f66428092a4fbb2070971acafd471aa49739c9e4'
-            '3dc075609561da40044c6547274cb463c92d458e59839972a291ea0830193bc8')
-
-prepare() {
-  cd "$srcdir/${_realname}-${pkgver}"
-
-  patch -p1 -i "${srcdir}"/0001-Cygwin-is-as-per-Windows.patch
-}
-
-build() {
-  cd "$srcdir/${_realname}-${pkgver}"
-  PERL_MM_USE_DEFAULT=1 perl Makefile.PL INSTALLDIRS=vendor
-  make
-}
-
-package() {
-  cd "$srcdir/${_realname}-${pkgver}"
-  make install DESTDIR="$pkgdir"
-}