Also recognize __sighndlr on Solaris/x86
    
    Unlike Solaris/SPARC, the __sighndlr function isn't recognized as part
    of a signal handler, causing a couple of testcases to fail.
    
    The following patch fixes that.  A followup patch will move this to
    common code to avoid such unnecessary discrepancies between
    Solaris/SPARC and x86 in the future.
    
    While this fixes a couple of backtraces to now correctly print
    
    #1  <signal handler called>
    
    they often fail later with
    
    #2  0x0ff3ffffff00857f in ?? ()
    Backtrace stopped: Cannot access memory at address 0xff3000002e0886f
    
    which needs further investigation.
    
    Tested on amd64-pc-solaris2.11 (running the tests with both -m64 and
    -m32).
    
    	* amd64-sol2-tdep.c (amd64_sol2_sigtramp_p): Also recognize
    	__sighndlr.
    	* i386-sol2-tdep.c (i386_sol2_sigtramp_p): Likewise.