Even more tweaks to the fitsio-src feature.
Even more tweaks to the fitsio-src feature.

When building cftisio from source, use all local CPUs (i.e. -j4 -> -j).
Also use the local CPU's instruction set (i.e. -march=native).

mindriot101/rust-fitsio,mindriot101/rust-fitsio,mindriot101/rust-cfitsio,mindriot101/rust-fitsio,mindriot101/rust-fitsio,mindriot101/rust-cfitsio,mindriot101/rust-fitsio