10495 libc should know how many FPU exceptions there are

*** 25,36 ****
   */
  
  #ifndef _SYS_IEEEFP_H
  #define _SYS_IEEEFP_H
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"        /* SunOS4.0 1.6 */
- 
  #ifdef  __cplusplus
  extern "C" {
  #endif
  
  /*
--- 25,34 ----
*** 58,67 ****
--- 56,66 ----
          fp_division     = 1,
          fp_underflow    = 2,
          fp_overflow     = 3,
          fp_invalid      = 4
  };
+ #define N_IEEE_EXCEPTION 5      /* Number of floating-point exceptions. */
  
  enum fp_trap_enable_type {      /* trap enable bits according to bit number */
          fp_trap_inexact = 0,
          fp_trap_division        = 1,
          fp_trap_underflow       = 2,
*** 91,100 ****
--- 90,100 ----
          fp_division     = 2,
          fp_overflow     = 3,
          fp_underflow    = 4,
          fp_inexact      = 5
  };
+ #define N_IEEE_EXCEPTION 6      /* Number of floating-point exceptions. */
  
  enum fp_trap_enable_type {      /* trap enable bits according to bit number */
          fp_trap_invalid = 0,
          fp_trap_denormalized    = 1,
          fp_trap_division        = 2,