LoongArch64: Update symv lsx version

LoongArch64: Fix dsymv and ssymv LASX version

Azure CI: update deprecated macos-12 jobs to macos-13 image

"fmov.d $f2, $f4" leaves all the bits higher than the 63-th bit
unpredictable but it's obvious that the following code uses the value of
those high bits.  We actually want to replicate the lower 64 bits here,
so we should use xvreplve0.d instead.

LA464 (Loongson 3[A-Z]-5000) happens to replicate them for us due to
some uarch internal details so the issue was not detected, but for LA664
(Loongson 3[A-Z]-6000) and future uarch we need to do things correctly
or we end up getting a lot of test failures.

Closes: https://bbs.aosc.io/t/topic/302
Signed-off-by: Xi Ruoyao <xry111@xry111.site>

merge release 0.3.29 back into develop to copy tag

Merge changes from develop in preparation of the 0.3.29 release

Update the Changelog for version 0.3.29

Replace LAPACK ?LARFT with a recursive implementation (Reference-LAPACK PR 1080)

Remove comparison that is always false (Reference-LAPACK PR 1062)

Replace while loop in generic C/ZGEMM_BETA to avoid going out of bounds

Optimize the omatcopy_cn/zomatcopy_cn kernels with RVV 1.0 intrinsic.

Add the test cases of rot to improve the unit tests for rot_rvv.

LoongArch64: Update symv

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

Cirrus CI: Update FreeBSD jobs to 14.1

Signed-off-by: tingbo.liao <tingbo.liao@starfivetech.com>

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.