Remove DISABLE_COMPLEX_MACRO definitions, since people seem to be getting

by without them.

Don't check for preprocessor symbols from system header files in port
include files, since those header files aren't included at this point.

src/include/port/sco.h

-#ifndef NOFILE
-#define NOFILE			NOFILES_MIN
-#endif
-
-#define DISABLE_COMPLEX_MACRO
-
 /* see src/backend/libpq/pqcomm.c */
 #define SCO_ACCEPT_BUG
 

src/include/port/univel.h

@@ -9,8 +9,6 @@
 
 typedef unsigned char slock_t;
 
-#define DISABLE_COMPLEX_MACRO
-
 #ifndef			BIG_ENDIAN
 #define			BIG_ENDIAN		4321
 #endif

src/include/port/unixware.h

@@ -12,8 +12,6 @@
 
 typedef unsigned char slock_t;
 
-#define DISABLE_COMPLEX_MACRO
-
 #ifndef			BIG_ENDIAN
 #define			BIG_ENDIAN		4321
 #endif