New review comment by classabbyamp on void-packages repository

https://github.com/void-linux/void-packages/pull/39984#discussion_r997579349

Comment:
```suggestion

FFLAGS="-fallow-argument-mismatch"
CFLAGS="-I${XBPS_CROSS_BASE}/usr/include/SPOOLES -DARCH=Linux -DSPOOLES -DARPACK -DMATRIXSTORAGE -DNETWORKOUT"
```
`xbps-src` integrates the CFLAGS/FFLAGS specified at the top level of the template into its own, and then exposes that to the packaging phases, so we can trim this down