PATCH: fix a typo in gas/testsuite/gas/elf/elf.exp

[Ben Elliston]

> > !     if (![istarget "mn10300-*-*"] && ![istarget "am3*-*-*"]} then {
> > !     if {![istarget "mn10300-*-*"] && ![istarget "am3*-*-*"]} then {
> 
> I wonder why this did not show up in my tests.  Hmmm.

Good question.  Just testing it out, Tcl said:

syntax error in expression "(1": looking for close parenthesis

However, something in the framework may just be catching the error and
disposing of the error message.  ;-/

Ben