Macro redefined warnings in zftp.c

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

Just noticed these (harmless but lengthy) compiler warnings when building
on MacOS:


In file included from zftp.c:54:
./zftp.mdh:5:12: warning: 'boot_' macro redefined
#   define boot_ boot_zshQszftp
           ^
./tcp.mdh:5:12: note: previous definition is here
#   define boot_ boot_zshQsnetQstcp
           ^
In file included from zftp.c:54:
./zftp.mdh:6:12: warning: 'cleanup_' macro redefined
#   define cleanup_ cleanup_zshQszftp
           ^
./tcp.mdh:6:12: note: previous definition is here
#   define cleanup_ cleanup_zshQsnetQstcp
           ^
In file included from zftp.c:54:
./zftp.mdh:7:12: warning: 'features_' macro redefined
#   define features_ features_zshQszftp
           ^
./tcp.mdh:7:12: note: previous definition is here
#   define features_ features_zshQsnetQstcp
           ^
In file included from zftp.c:54:
./zftp.mdh:8:12: warning: 'enables_' macro redefined
#   define enables_ enables_zshQszftp
           ^
./tcp.mdh:8:12: note: previous definition is here
#   define enables_ enables_zshQsnetQstcp
           ^
In file included from zftp.c:54:
./zftp.mdh:9:12: warning: 'setup_' macro redefined
#   define setup_ setup_zshQszftp
           ^
./tcp.mdh:9:12: note: previous definition is here
#   define setup_ setup_zshQsnetQstcp
           ^
In file included from zftp.c:54:
./zftp.mdh:10:12: warning: 'finish_' macro redefined
#   define finish_ finish_zshQszftp
           ^
./tcp.mdh:10:12: note: previous definition is here
#   define finish_ finish_zshQsnetQstcp
           ^
6 warnings generated.