5632 libm's use of _sse_hw is wrong and unnecessary (in that order)

*** 48,60 ****
  #else
  /*
   * The following variable lives in libc on Solaris 10, where it
   * gets set to a nonzero value at startup time on systems with SSE.
   */
! int _sse_hw = 0;
! #pragma weak _sse_hw
! #define test_sse_hw     &_sse_hw && _sse_hw
  #endif
  
  static int accrued = 0;
  static thread_key_t accrued_key;
  static mutex_t accrued_key_lock = DEFAULTMUTEX;
--- 48,59 ----
  #else
  /*
   * The following variable lives in libc on Solaris 10, where it
   * gets set to a nonzero value at startup time on systems with SSE.
   */
! extern int _sse_hw;
! #define test_sse_hw     _sse_hw
  #endif
  
  static int accrued = 0;
  static thread_key_t accrued_key;
  static mutex_t accrued_key_lock = DEFAULTMUTEX;