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Bug#702784: Use of nested functions in configure check

Package: gnats
Version: 4.1.0-2
Usertags: goto-cc

gnats/configure.in.nse uses AC_TRY_COMPILE to check for a properly supported
"const". The second argument of this macro is supposed to be a function body,
but this configure.in includes two function definitions (see result below),
resulting in nested functions.

| int
| main ()
| {
| const char *foo(const char *x) { return x; }
|                 int bar(const char *x) { return x == foo(x); }
|   ;
|   return 0;
| }

This is accepted by GCC, but other compilers (including CLANG) reject this GCC
extension. As a result, the gcc command lines include -Dconst=, which breaks
the build when trying to compile fconfigl.c.


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