update, based on how the underlying file was opened. Obsoletes
FASCIST_FDOPEN.
* hosts/rs6000.h, hosts/tahoe.h, hosts/vaxbsd.h: Remove
all FASCIST_FDOPEN config defines.
* targets.c, config/i960-bout.mt, hosts/*: added
HOST_BIG_ENDIAN_DEFAULT_VECTOR and
HOST_LITTLE_ENDIAN_DEFAULT_VECTOR because bout archive format
depends on the endianness of the host. Added #define
HOST_BIG_ENDIAN_P and #undef HOST_BIG_ENDIAN_P to a number of
configuration files in hosts/ (it was already in some).
* hosts/h-hp9000.h: Remove USG comment.
* hosts/h-rs6000.h: Include <stdlib.h> for malloc.
* hosts/h-news.h, h-sparc-64.h: New config files that had
previously been kludged in the <sysdep.h> file.