frexpl tweak

[Bruno Haible]

Since the function frexpl() is missing a declaration on some systems, the
test whether it works needs to declare it.


2007-03-29  Bruno Haible  <[EMAIL PROTECTED]>

        * m4/frexpl.m4 (gl_FUNC_FREXPL_WORKS): Declare frexpl.

*** m4/frexpl.m4        25 Mar 2007 22:21:06 -0000      1.3
--- m4/frexpl.m4        29 Mar 2007 23:59:14 -0000
***************
*** 68,73 ****
--- 68,74 ----
      [
        AC_TRY_RUN([
  #include <math.h>
+ extern long double frexpl (long double, int *);
  int main()
  {
    volatile long double x;