New review comment by classabbyamp on void-packages repository

https://github.com/void-linux/void-packages/pull/38902#discussion_r955284931

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
```
and move python3-devel to makedepends