Disable the SkyLakeX DGEMMIxCOPY kernels as well

#1955

as a stopgap measure for https://github.com/numpy/numpy/issues/13401 as mentioned in #1955

Misc. typo fixes in comments and documentation

sgemm/strmm kernel for power9

Correct argument of CPU_ISSET for glibc <2.5

fixes #2104

Found via `codespell -q 3 -w -L ith,als,dum,nd,amin,nto,wis,ba -S ./relapack,./kernel,./lapack-netlib`

Disable repeated recursion on Ab_BR in ReLAPACK xGBTRF

due to crashes in LAPACK tests

Disable reallocation of work array in ReLAPACK xSYTRF

Correct INFO=4 condition in ReLAPACK xGETRF

as it appears to cause memory management problems (seen in the LAPACK tests)

Avoid out-of-bounds accesses in LAPACK EIG tests

Correct length of name string in xerbla call

see https://github.com/Reference-LAPACK/lapack/issues/333

Fix ReLAPACK integration problems

1. Replaced all instances of "int" with "blasint"
2. Added string length as "hidden" third parameter in calls to fortran XERBLA

snprintf define consolidated to common.h

Add (C)BLAS extension ?sum

Add in runtime CPU detection for POWER.

Add -lm and disable EXPRECISION support on *BSD

fixes #2075

Detect 32bit environment on 64bit ARM hardware

for #2056, using same approach as #2058

as trivial copies of the respective ?asum kernels with the ABS and vflpsb calls removed

as trivial copy of ?asum with the fabs calls removed

as trivial copy of ?asum with the fabs calls removed

as trivial copy of ?asum with the fabs replaced by fmov to preserve code structure

as trivial copy of ?asum with the fabs replaced by fmr to preserve code structure

as trivial copy of ?asum with the fabs replaced by mov to preserve code structure