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Fix build on macOS

Ruoyu Zhong requested to merge ZhongRuoyu/fakeroot:macos-spawn_h into upstream

In https://github.com/Homebrew/homebrew-core/pull/136310, fakeroot 1.32 failed to build on macOS due to the following error:

In file included from libfakeroot_time64.c:19:
./wrapped.h:43:88: error: unknown type name 'posix_spawn_file_actions_t'
extern int my_posix_spawn (pid_t * __restrict pid, const char * __restrict path, const posix_spawn_file_actions_t *file_actions, const posix_spawnattr_t * __restrict attrp, char *const argv[ __restrict], char *const envp[ __restrict]) __attribute__((visibility("hidden")));
                                                                                       ^
./wrapped.h:43:136: error: unknown type name 'posix_spawnattr_t'
extern int my_posix_spawn (pid_t * __restrict pid, const char * __restrict path, const posix_spawn_file_actions_t *file_actions, const posix_spawnattr_t * __restrict attrp, char *const argv[ __restrict], char *const envp[ __restrict]) __attribute__((visibility("hidden")));
                                                                                                                                       ^
./wrapped.h:44:89: error: unknown type name 'posix_spawn_file_actions_t'
extern int my_posix_spawnp (pid_t * __restrict pid, const char * __restrict path, const posix_spawn_file_actions_t *file_actions, const posix_spawnattr_t * __restrict attrp, char *const argv[ __restrict], char *const envp[ __restrict]) __attribute__((visibility("hidden")));
                                                                                        ^
./wrapped.h:44:137: error: unknown type name 'posix_spawnattr_t'
extern int my_posix_spawnp (pid_t * __restrict pid, const char * __restrict path, const posix_spawn_file_actions_t *file_actions, const posix_spawnattr_t * __restrict attrp, char *const argv[ __restrict], char *const envp[ __restrict]) __attribute__((visibility("hidden")));
                                                                                                                                        ^
4 errors generated.

This patch fixes the above error.

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