main/musl: cherry-pick upstream fixes

...emove-use-of-buggy-.SECONDARY-special-target-in-mak.patch

main/musl/0002-implement-arm-eabi-mem-functions.patch

.../0003-fix-fclose-of-permanent-stdin-out-err-streams.patch

...l/0004-make-nl_langinfo-CODESET-always-return-UTF-8.patch

...05-fix-breakage-in-nl_langinfo-from-previous-commit.patch

...06-remove-unused-and-invalid-C-version-of-sigsetjmp.patch

...-fix-missing-earlyclobber-flag-in-i386-a_ctz_64-asm.patch

...ix-uninitialized-scopeid-in-lookups-from-hosts-file.patch

main/musl/APKBUILD

main/musl/no-utf8-code-units-locale.patch