main/musl: backport fixes from 1.2.0

wcwidth wrongly returned 0 for most of planes 4 and up
missing case mapping between U+03F3 and U+037F
wrong cacosh results for arguments with negative imaginary part
wrong catanf/catanl results for various classes of arguments
wrong return value for ungetc with argument outside [0,UCHAR_MAX]
posix_openpt with no ptys available produced wrong errno
7 jobs for !5008 with musl-thumb2-memcpy in 4 minutes and 1 second
latest detached
Status Job ID Name Coverage
  Lint
failed #61451
x86_64 docker-alpine allowed to fail
lint

00:00:34

 
  Build
passed #61456
aarch64 ci-build docker-alpine
build-aarch64

00:00:45

passed #61457
armv7 ci-build docker-alpine
build-armv7

00:00:56

passed #61455
ppc64le ci-build docker-alpine
build-ppc64le

00:01:02

passed #61454
s390x ci-build docker-alpine
build-s390x

00:01:10

passed #61453
x86 ci-build docker-alpine
build-x86

00:00:35

passed #61452
x86_64 ci-build docker-alpine
build-x86_64

00:00:34

 
Name Stage Failure
failed
lint Lint
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