x86: Remove linker option: -z prefix-nop
    
    Since it is incorrect to convert
    
    	bnd call *foo@GOTPCREL(%rip)
    
    to
    
    	bnd nop
    	call foo
    
    this patch removes the "-z prefix-nop" option from x86 linker.
    
    	* emulparams/call_nop.sh: Remove -z prefix-nop.
    	* ld.texinfo: Likewise.
    	* testsuite/ld-i386/call3c.d: Check for linker error.
    	* testsuite/ld-x86-64/call1c.d: Likewise.
    
    (cherry picked from commit 4a4a4a27ba5c731044d3d3594545e6f06b0ec0e5)