Remove all cygwin CHOST changes

Since #5448 CHOST defaults to cygwin now, so this
is no longer needed.

python/PKGBUILD

@@ -98,11 +98,10 @@ build() {
   cd "${srcdir}/Python-${pkgver}"
 
   export MSYSTEM=CYGWIN
-  local CYGWIN_CHOST="${CHOST/-msys/-cygwin}"
   ./configure \
     --prefix=/usr \
-    --build=${CYGWIN_CHOST} \
-    --host=${CYGWIN_CHOST} \
+    --build=${CHOST} \
+    --host=${CHOST} \
     --enable-shared \
     --enable-ipv6 \
     --with-dbmliborder=gdbm \