Do not check LDVT in LAPACKE_?gesvd_work if VT is not used anyway

Cirrus CI: Update FreeBSD jobs to 14.1

remove fastmath from x280 target

Update Makefile.riscv64

remove fast-math

Rewrite the "Build system" documentation page

PPC970: fix scal

Content is reviewed fairly carefully, and should be up to the
same standard as the rest of the docs now.

Uses Mermaid to render it as a diagram in the html docs.

The doc build is now clean of warnings again.

This only fixes Markdown syntax, and adds a few headers to bring
some structure into the long list of variables that influence the
build. It does not add or remove variables.

Add a documentation page for the runtime variables

This reverts commit 9b9c0aa5c9.

Add build instructions for Huawei's HarmonyOS to the documentation

Temporarily disable the default S/DSCAL kernel on PPC970

[WIP,Testing] Add CI workflow to test crossbuilding for Huawei HarmonyOS

Identify all cores in ARM64 autodetection, return fastest TARGET and performance group sizes

Optimize the nrm2_rvv function to further improve performance.

Add an install_tests target to facilitate testing cross-compiles

Fix "make install" creating incorrect names for suffixed libraries in the cmake and pkgconfig files

Restore libsuffix support in pkg-config file