[patch] Fix array aliasing conftest

[Ken Werner]

Hi,

while looking at the autoconf scripts I noticed newlibs check for array 
aliasing support (_HAVE_ARRAY_ALIASING). The configure.in specifies the 
following conftest:
  char x[3] = { 'a', 'b', 'c' };
  extern char y[2] __attribute__((alias ("x+1")));
This looks valid but autoconf strips the square brackets. The generated 
configure states:
  char x3 = { 'a', 'b', 'c' };
  extern char y2 __attribute__((alias ("x+1")));
I think this has never compiled as intended. Adding additional square brackets 
in the configure.in seem to fix that. A patch is attached.

Regards
Ken

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