[PATCH] configure: escape square brackets.

[Benjamin Kramer]

M4 eats the [] from char *argv[] in the autoconf check "whether build  
system compiler is ANSI". clang does not like the mutilated function  
prototype and complains:

conftest.c:1:5: error: second argument of 'main' should be of type  
'char **'
int main (int argc, char *argv) { exit(0); }
     ^

configure detects clang as a non-ANSI-compliant compiler and the  
compilation process fails later on. The attached patch fixes this by  
escaping the [] with an extra pair of square brackets.

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