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 !4794 with 3.11-stable-musl-url-and-thumb-fix in 1 minute and 51 seconds
latest detached
Status Job ID Name Coverage
  Lint
failed #61501
x86_64 docker-alpine allowed to fail
lint

00:00:30

 
  Build
passed #61506
aarch64 ci-build docker-alpine
build-aarch64

00:00:44

passed #61507
armv7 ci-build docker-alpine
build-armv7

00:01:14

passed #61505
ppc64le ci-build docker-alpine
build-ppc64le

00:01:05

passed #61504
s390x ci-build docker-alpine
build-s390x

00:01:18

passed #61503
x86 ci-build docker-alpine
build-x86

00:00:46

passed #61502
x86_64 ci-build docker-alpine
build-x86_64

00:00:48

 
Name Stage Failure
failed
lint Lint
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