Noteworthy changes in version 1.51 (2024-11-11)

• Allow initialization of new Windows threads to utf8 mode. [T7185]
• Add GPGRT_PROCESS_ALLOW_SET_FG for gpgrt_process_spawn. [rEb79d4206f4]
• Add new spawn function to modify the environment. [T7307]
• Fix missing environ var for macOS and others. [T7169,T7307]
• Fix forgotten _gpgrt_post_syscall on create pipe failure. [rEbcab96484d]
• Let gpgrt_poll return an error for a closed fd. [rE4a3dc85f69]
• Fix build error introduced by C-committee stupidity. [T7344]

Interface changes relative to the 1.50 release:

_gpg_w32_gettext_use_utf8           EXTN (new value 2).
gpgrt_spawn_actions_set_env_rev     NEW.
GPGRT_PROCESS_ALLOW_SET_FG          NEW.

(prev: T7102)