maturin: fix default wheel tag

For our Python at least, upstream cygwin still includes the version
in sysconfig.get_platform().

python-cryptography/PKGBUILD

@@ -3,7 +3,7 @@
 _realname=cryptography
 pkgname=python-cryptography
 pkgver=46.0.3
-pkgrel=1
+pkgrel=2
 pkgdesc="A package designed to expose cryptographic recipes and primitives to Python developers"
 arch=('i686' 'x86_64')
 license=('spdx:Apache-2.0 OR BSD-3-Clause')
@@ -31,9 +31,6 @@ build() {
   # XXX: to fix maturin OS detection
   export MSYSTEM=CYGWIN
 
-  # XXX: to fix the maturin wheel tag
-  export _PYTHON_HOST_PLATFORM=$(python -c "import sysconfig, sys; sys.stdout.write(sysconfig.get_platform())")
-
   # XXX: this should be handled by maturin/pyo3 somehow
   local link_arg=$(python -c "import sysconfig; print(sysconfig.get_config_var('LIBPYTHON'))")
   export RUSTFLAGS="-C link-arg=$link_arg"