New review comment by classabbyamp on void-packages repository

https://github.com/void-linux/void-packages/pull/36304#discussion_r878915734

Comment:
```suggestion
if [ -n "$CROSS_BUILD" ]; then
	export PYPREFIX="$XBPS_CROSS_BASE"
	export CFLAGS+=" -I${XBPS_CROSS_BASE}/${py3_inc} -I${XBPS_CROSS_BASE}/usr/include"
	export LDFLAGS+=" -L${XBPS_CROSS_BASE}/${py3_lib} -L${XBPS_CROSS_BASE}/usr/lib"
	export CC="${XBPS_CROSS_TRIPLET}-gcc -pthread $CFLAGS $LDFLAGS"
	export LDSHARED="${CC} -shared $LDFLAGS"
	export PYTHONPATH="${XBPS_CROSS_BASE}/${py3_lib}"
	for f in ${XBPS_CROSS_BASE}/${py3_lib}/_sysconfigdata_*; do
			f=${f##*/}
			_PYTHON_SYSCONFIGDATA_NAME=${f%.py}
	done
	export _PYTHON_SYSCONFIGDATA_NAME
fi
```
i think this should work. the critical thing was the `_PYTHON_SYSCONFIGDATA_NAME` from the host leaking in when it wasn't specified.