Make psignal prototype in libiberty match that in glibc.

 Fixes:

 gcc-2.95.3-glibc-2.1.3/binutils-2.15/libiberty/strsignal.c: In function `psignal':

 gcc-2.95.3-glibc-2.1.3/binutils-2.15/libiberty/strsignal.c:563: argument `signo' doesn't match prototype

 /usr/include/signal.h:131: prototype declaration

 gcc-2.95.3-glibc-2.1.3/binutils-2.15/libiberty/strsignal.c:563: argument `message' doesn't match prototype

 /usr/include/signal.h:131: prototype declaration

 gcc-2.95.3-glibc-2.1.3/binutils-2.15/libiberty/strsignal.c:568: warning: comparison between signed and unsigned

 mprotect... make[1]: *** [strsignal.o] Error 1

 make[1]: Leaving directory `/export/hda3/dkegel/queue/jobdir.produser_cpsm17/crosstool-0.32/build/i686-unknown-linux-gnu/gcc-2.95.3-glibc-2.1.3/build-binutils/libiberty'

 make: *** [all-libiberty] Error 2

 when building on red hat 7.1

 though it's a bit of a mystery why libiberty's psignal is being compiled at

 all, since red hat 7.1's glibc supports psignal (hence the error message)

 --- binutils-2.15/libiberty/strsignal.c.old	2005-04-18 13:57:40.000000000 -0700

 +++ binutils-2.15/libiberty/strsignal.c	2005-04-18 13:59:09.000000000 -0700

 @@ -544,7 +544,7 @@

  /*

 -@deftypefn Supplemental void psignal (unsigned @var{signo}, char *@var{message})

 +@deftypefn Supplemental void psignal (int @var{signo}, const char *@var{message})

  Print @var{message} to the standard error, followed by a colon,

  followed by the description of the signal specified by @var{signo},

 @@ -557,9 +557,7 @@

  #ifndef HAVE_PSIGNAL

  void

 -psignal (signo, message)

 -  unsigned signo;

 -  char *message;

 +psignal (int signo, const char *message)

  {

    if (signal_names == NULL)

      {