Remove more unused macros.

admin/CPP-DEFINES

@@ -60,7 +60,6 @@ BAUD_CONVERT
 BROKEN_FIONREAD
 BROKEN_SELECT_NON_X
 BROKEN_SIGIO
-BROKEN_START
 BROKEN_TIOCGETC
 BROKEN_TIOCGWINSZ
 BSD4_2
@@ -93,9 +92,6 @@ DOT_GLOBAL_START
 DUMMIES
 EEOF
 ELF
-ERROR0
-ERROR1
-ERROR2
 EXEC_HDR_TYPE
 EXEC_MAGIC
 EXEC_PAGESIZE
@@ -172,7 +168,6 @@ LIB_X11_LIB
 LINKER
 LOAD_AVE_CVT
 LOAD_AVE_TYPE
-LONG_ALIGN
 L_SET
 MAIL_PROGRAM_NAME
 MAIL_USE_FLOCK
@@ -181,7 +176,6 @@ MEMMOVE_MISSING
 MEMORY_IN_STRING_H
 MKDIR_PROTOTYPE
 MOTIF
-M_TERMINFO
 NARROWPROTO
 NEED_ERRNO
 NEED_NET_ERRNO_H
@@ -218,8 +212,6 @@ PNTR_COMPARISON_TYPE
 POSIX_SIGNALS
 PREFER_VSUSP
 PTY_ITERATION
-PTY_MAJOR
-PTY_MINOR
 PTY_NAME_SPRINTF
 PTY_OPEN
 PTY_TTY_NAME_SPRINTF
@@ -287,7 +279,6 @@ XSET
 XUINT
 X_DEFAULT_FONT
 _ABIN32
-_CX_UX
 _MIPS_SZLONG
 _POSIX_SOURCE
 __main