+ Change by Jim Wilson:
+ Add #undef before every #define, Dec 92.
+ Use stddef.h not gstddef.h, Mar 94.
+
+ Changes by Paul Eggert, installed Feb 93:
+ (fake_f_rep): Clear all of u, initially. Make the ints in u unsigned.
+ (f_define): Use ordinary constants for long double
+ if it's same width as double. Make __convert_long_double_i unsigned.
+ Richard Stallman, May 93:
+ In F_check, check NO_LONG_DOUBLE_IO.
+
+ Changes by Stephen Moshier, installed Sep 93:
+ (FPROP): Recognize 80387 or 68881 XFmode format.
+
+ Change by Manfred Hollstein, installed Mar 98:
+ (bitpattern): Change type of variable i to unsigned int.
+
+